Death and post-mortem. Sometime after her interview with Rita Skeeter, Bathilda was murdered through the Dark Arts and her body was animated by Lord Voldemort. Voldemort did this using his snake, Nagini.
Her body disappears and gives way to Nagini, while Hermione finds what seems to be the snake's changed skin. Nagini's impersonation of Bathilda is, nevertheless, an intended trap by Voldemort for Harry, which might have put his most important Horcrux in jeopardy.
During this time, Voldemort killed a witch called Bertha Jorkins, and J. K. Rowling confirmed it was through her murder that he turned Nagini into a Horcrux. But Nagini was reintroduced in Fantastic Beasts: The Crimes of Grindelwald, which complicated the previous assumption that he'd met her in Albania.
Bathilda's recently deceased corpse was re-animated, as an inferus, and the snake, with Voldemort and some magic, hid within it.
Before now, Claudia Kim's character had only been known as 'the Maledictus'. A 'Maledictus' is a carrier of a blood curse which will ultimately destine them to transform permanently into a beast. It transpires that Nagini the snake, from Harry Potter, used to be a woman with a terrible curse.
The police chief told the Times of India a woman was found in the snake's stomach and that her body appeared to be largely intact. "After splitting the snake's belly by residents, it turned out that... the woman was (the missing woman) who had died," Harefa said to CNN Indonesia.
Nagini was originally a female human Maledictus, with the ability to transform into a snake.
Bagshot is best known for writing Harry's History of Magic textbook. In the weeks after Dumbledore's death, Rita Skeeter preyed on Bagshot's old age and failing mind to conduct invasive interviews on the Dumbledore family.
Bathilda Bagshot has actually been dead for weeks, which explains the flies and blood handprints Hermione finds. Her body has been inhabited by Nagini, Voldemort's snake put there to trap Harry because Voldemort suspected, just as Hermione said, that Harry would return to the town where he was born.
Moreover all she could hear would be hissing from the other room which can easily be disregarded. That is why Bathilda didn't speak in the same room as Hermione otherwise she would have made the connection that the hissing sound is actually coming from Bathilda herself.
Unless one or the other has a significantly smaller role in the films than we are led to believe, Dumbledore and Nagini will get to know each other. From the very little we see of Nagini, it looks like she's at least potentially on the same side as Dumbledore.
It wasn't just inanimate objects that could become Horcruxes. Lord Voldemort's beloved snake companion, Nagini, was also transformed into one, and Dumbledore seemed to know it, ominously predicting that a day would come where Voldemort would 'fear for his snake'.
When Harry and Hermione are on the first floor of Bathilda's house, Nagini (inside the corpse of Bathilda) tells Harry to "Come!" from the next room in Parseltongue. In reaction, Hermione jumps and clutches Harry's arm, and the two of them obey the command.
Bathilda Bagshot & Gellert Grindelwald
Despite his many flaws (wanting to take over the wizarding world, for example), Bathilda clearly had a soft spot in her heart for her great nephew, and even had his photo in a frame at her home decades after he was defeated by Dumbledore and put into prison.
Bathilda Bagshot attacked Harry and Hermione at Godric's Hollow because Nagini had been placed inside of her reanimated corpse after Voldemort had killed her. That's why she turned into a snake. Bathilda Bagshot is dead and Voldemort's snake Nagini took on her body.
Bathilda is a very old witch and the former neighbor of the Dumbledore family in Godric's Hollow. As such, she knows quite a bit about the family's past, including the darker and more tragic parts. As the great aunt of Gellert Grindelwald, it was actually Bathilda who introduced Dumbledore to the future Dark wizard.
Within the next several years, Bathilda sent an owl to Albus Dumbledore (then a Hogwarts student) having been favourably impressed by his paper on trans-species Transfiguration for the scholarly journal Transfiguration Today. This initial contact led to her being acquainted with the rest of the Dumbledore family.
The information in this broadcast will prove extremely heartening to Harry, as he learns that he is not alone in fighting Voldemort. It will, however, inadvertently result in the Trio being captured. We learn later that the doe was Severus Snape's Patronus.
Severus Snape: Doe
This indicates that Lily also had a doe patronus. Snape's patronus also leads Harry and Ron (Rupert Grint) to the sword of Gryffindor, though the boys don't know who it belongs to.
Nagini hadn't been Transfigured into Bathilda, she was inside Bathilda's dead body. That's why Harry thought either Bathilda or her house smelled bad. “She smelled bad, or perhaps it was her house: Harry wrinkled his nose as they sidled past her and pulled off the Cloak.”
Originally Answered: In Harry Potter, why did Snape put the Sword of Gryffindor at the bottom of a frozen lake, as opposed to making it easy for Harry/Ron to get it? He put it in the bottom of the lake because only a true, brave, Gryffindor could acquire the sword.
Bathilda was also the great-aunt of Gellert Grindelwald, the infamous Dark Wizard who was defeated by Albus Dumbledore. Harry and Bathilda Bagshot's body inhabited by Nagini speak Parseltongue People who were not Parselmouths but were able to speak or understand Parseltongue through various means: …
J.K. Rowling recently gave more insight into one of the most controversial characters in the Wizarding World: Nagini, who was known only as Voldemort's snake in "Harry Potter," but appears as a woman in the prequel series, "Fantastic Beasts."
Nagini, it turns out, was actually a Maledictus—a witch with a blood curse that turns her permanently into a beast (in her case, a giant snake). In the film, the witch is played by Claudia Kim.
Sorcerer's Stone - he speaks to the snake in the cage at the zoo. Chamber of Secrets - he tells Draco's conjured snake not to attack another student. Deathly Hollows - he speaks with Bathilda Bagshot (who is actually Nagini).