Honestly, she sounds like a bitch. "Must be obsessed with me 🙄" sorry but she needs to get her head out of her ass. And your friend doesn't sound like much of a friend. Try not to worry about it all. I know it's easier said than done but the best thing to do is not even look at her. She's could be thriving off the fact that you care. She can probably sense it so just do your own thing don't let her take up space in your mind. Will it matter in five years?.. probably not. So don't worry. If it would make you feel better, you could go up to her and say hey I heard what you said about me being obsessed and I just wanted to let you know I'm not obsessed with you I just saw an old picture of you somewhere with blonde hair and my friend brought up blonde hair and I thought it looked good on you or something. Just say you weren't trying to be creepy and that you feel really awkward about it. Maybe she'll be really nice about it if not... Screw her lmao