How do I prove to her that I’m bi without sounding creepy?

I knew this lesbian. We were in a class last semester where she admitted her sexuality.
Halfway in the semester she moved seats and sat diagonally behind me (next to her acquaintance behind me) As I was walking in class to my seat, I looked over and noticed she was looking at me. It was kinda awkward and her expression was open almost looked like she wanted to say something. And I’m not exaggerating by saying this but she kind of was looking at me with want lol. I broke the eye contact and sat down. It went on for maybe like 3-4 seconds as I was walking up until I looked away.
This semester she changed her appearance a little and I’m attracted to her now. She has another friend in the class who she always talks to and sits next to. The friend is social. On the first day of class at the end we had to go around class and mention something and the girl waited until it got to me then left after I spoke.
I’ve seen her glance at me a few times. I’ve seen her talk to other girls in the hall and stuff but I don't know if she’s shy around me or thinks I wouldn’t like her ( I look kinda mean or ig stuck up ) weeks ago she sat next to me because her seat next to her friend got taken. I was excited but kind of nervous and she chose the seat next to me when there were others. Her feet were kinda near mine and I saw her fidgeting with her hands but she seemed chilled out and didn’t talk to me and it’s annoying especially when I’ve seen her do it for other girls.
I am pretty and have been told I am but I’m very feminine so most people assume I’m straight when I’m bi so maybe she thinks i wouldn’t be interested. The semester ended today and we didn’t have chances to talk so would it be creepy to email her now and tell her I thought she was cute or something? if it sounds creepy then I won’t lol.
pls don’t say talk to her lol because the semester is over. I’m not in love with her but think she’s hot and would be fun. She’s super lowkey. Should I do it or let it go?
How do I prove to her that I’m bi without sounding creepy?
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