One possibility is the simplest one available, which would hinge on the rules put on the hammer by Odin's enchantment, which are “Whoever holds this hammer, if he be worthy, shall possess the power of
As shown in flashback in MIGHTY THOR (2015) #705, Jane was telepathically called by Mjolnir to the moon, and she picked up the magical hammer. (OG Thor would go by his last name “Odinson” as a result.)
The chemotherapy is attacking the cancerous cells but Mjolnir doesn't identify the cancer as an illness just as another part of her it needs to protect. Plus chemotherapy really does weaken Jane and make her sick so it's easy to see as an illness on it's own.
Jane Foster wields a broken Mjölnir in Thor: Love and Thunder - here's why. Natalie Portman makes her return to the MCU after her last proper appearance in Thor: The Dark World.
After War Thor's defeat, Jane ended up taking his cursed weapon into battle herself, knowing full well that it was on the verge of breaking, and when it ultimately shattered, she was helpless to stop the strange energies trapped within it from bonding with her.
Thor Odinson thought his old hammer Mjölnir had been lost forever. In Thor: Ragnarok, the God of Thunder (Chris Hemsworth) fought his evil sister Hela (Cate Blanchett) and lost—at least initially, anyway. In a devastating blow, Hela cracked Thor's mighty hammer into tiny bits.
During the battle, Brigid finally proved herself worthy of Mjölnir and became Thor, something MCU fans might predict happens to Love in live-action.
In a moment of wistful affection for his girlfriend, Thor asked his trusty hammer to always protect Jane, and in doing so unwittingly enchanted Mjolnir to do just that. Just like Thor's father Odin once enchanted the hammer to only be lifted by someone who is worthy, Thor cast a spell that let Jane use its powers.
Is Thor still worthy in Thor: Love and Thunder? It is pretty clear that Mjolnir chose Jane, not because Thor was unworthy, but because Thor's oath had instructed it do so. Sadly, the hammer cannot cure Jane's cancer, and can only transform and temporarily empower her.
Originally there was no restriction placed on the hammer for who can use it but after Thor's reckless behavior, Odin Borson placed an enchantment on it. This spell read "Whosoever holds this hammer, if he be worthy, shall possess the power of Thor." Only those deemed worthy to lift Mjolnir can.
While Mjolnir felt the need to protect Jane at any cost in Thor: Love and Thunder, the hammer also saw potential in her to do good. Once endowed with the powers of Thor, Jane proved a powerful ally, her kind heart guiding her as she fought alongside Thor and Valkyrie.
There are two versions of Mjolnir in the MCU. The one that was pulled from the timestream was returned to its proper place in the timeline by Captain America, so it's no longer a part of the equation. As for the present-day Mjolnir, it's still in pieces.
Yes, even Spider-Man has been worthy of holding the hammer of Thor. This is not your father's Spider-Man (well, actually, it could be if your dad was a kid in 1993), but instead is the Spider-Man of Marvel's distant future of 2099!
Avengers: Age Of Ultron Confirmed Iron Man Wasn't Worthy
Tony Stark was the second one to try, even joking about ruling Asgard if he lifted the hammer and what he would do as king, but his always overly-confident attitude quickly changed when he realized he couldn't lift the hammer.
The hammer was used extensively by Thor as his primary weapon until it was destroyed by Hela in 2017. The broken pieces were eventually made into a tourist attraction in New Asgard.
Mysteriously, the broken pieces of Mjolnir, the hammer of the thunder god, transformed her into the Mighty Thor and gifted her the superpowers of Thor, to battle threats internal and external. Wielding Mjolnir herself, she had become a godly protector and a new hero was born!
While the two leave Eternity, Eternity's mark is still seen in Gorr's daughter, Love (India Rose Hemsworth). She is not only the daughter of Gorr, but also technically a daughter of Eternity.
But when he reaches that cosmic being, he chooses to use his wish to resurrect his daughter right before he dies. Jane Foster promises Gorr with her own dying breath that Thor will take care of the child, and Thor, now heartbroken and alone, chooses to adopt the child.
Hela Is Simply More Powerful Than Mjolnir
We know Thor wasn't as powerful as the older and more experienced Hela, which is why Mjolnir still felt like it was superior to him. But Hela made the hammer seem inferior, suggesting she might have stopped Mjolnir, held it, and then shattered it with her raw strength.
However, some information about Sif is known. She is a goddess connected to the Earth and the wife of Thor, by whom she has a daughter named Thrud. She also has a son Ullr by an unknown father, and she has two stepsons named Magni and Modi. She is distinctively and indisputably blonde in the remaining original texts.
Gorr's daughter is played by India Rose Hemsworth, the daughter of Thor himself, Chris Hemsworth, and actress Elsa Pataky.
In the comics, Jane hesitates at the gates of Valhalla, not wanting her life to be over yet, until Thor and Odin combine forces to revive her. With a second chance at life, Jane makes her cancer treatments a priority, and goes back and heals up while Odinson takes up Mjolnir and becomes Thor again.
Venom Is Truly Worthy.
This is by far the most simple explanation, as it is in keeping with how Mjolnir has been used by other heroes besides Thor and Odin over the years.
Captain Marvel is one of the strongest Avengers; so much that she is one of the few characters who can lift Thor's hammer Mjolnir without being worthy.