Look at how she acts when she's around you—open body language, eye contact, and physical touch are signs that she could be interested. See what she says during a conversation; if she likes you, she might compliment you (or even tease you).
Shy girls tend to show their love through actions rather than words. Hence, if you see her offering help more often, it might be a sign that she likes you. If you are having a bad day and she is extra careful around you to help you escape that unfavorable phase, she may like you.
She may have good reasons for keeping a lid on her feelings for you. She's already in a relationship and isn't sure whom she wants to be with. She knows what she feels for you but doesn't want you to know just yet. She's ashamed of her feelings for you but can't help showing them sometimes.
If someone smiles a lot when they look at you and connects eye contact with smiling, it is usually because they find you attractive. They might also make fun of you and tease you, or try to make you laugh. If someone's into you, you make them nervous. Their heart will beat rapidly from being around you.
If she looks away really fast, or smiles, or blushes, she's into you. If she casually looks away and doesn't engage anymore, she's probably not into you. If she's talking to you and laughing/smiling a lot, she's flirting. If she's playing with her hair, she's flirting.
This is one of the most obvious signs that indicates she considers you nothing more than a friend. She is quite frank about her past dates, and pours her heart out. She blatantly talks about her guy crush and shares what all is going in her love life.
The best way to make her miss you is to give her the time of her life. Take her to amazing dates, cook her delicious meals or even make her go crazy with your amazing sex skills. Sing to her or take her somewhere special that she didn't expect at all.
Some girls may like shy guys, while others may not, just as some women may prefer outgoing men to those who are more reserved. Moreover, some women may like certain shy men and dislike others, choosing to focus on a person as a whole rather than a small sliver of someone's personality.
Silent men have a rich inner circle with intriguing feelings and thoughts, and this appears to act as a magnet between women. Women want to know what they are thinking, and they are unable to figure it out. This creates an intense aura around men and women are not able to break it down.
Sometimes, people blush because they are simply prone to blushing. You can tell the blushing is because of you if it happens more when you're around. If she blushes and turns away or even tries to apologize because it happens so much, it's probably because she knows that it's a tell that she's very much into you.
One of the most important characteristics that most women seek is modesty. Outspokenness, charity, and honesty are further feminine appeal traits that are always observed, along with humility. Nothing appeals to a woman more than a man with a great sense of self.
Keep your touches light and short so she doesn't get uncomfortable. If you two have been having a fun conversation so far, feel free to gently touch her on the hand or on the forearm. Don't go any higher than that, and definitely don't try to grab her waist or anywhere on her torso.