It doesn't sound like she was very interested at all.. You said it yourself, she's a bitch and was probably just fishing for attention.. Best thing would be to follow the advice above, remember that you're the prize not some hb10 and if she's not treating you like the prize you don't have time for her.. You could maybe get a close later on, after maybe getting with a few girls she knows she'll realise that you're desirable and then she'll start chasing after which you'll be say something like "I wish I had 2 phones so that i could give you the one that's for people who i don't want to give me number to"

said with a smile ofc