My crush (15) spoke to me (16), but what now?

Anonymous
So, my crush is very shy and Thursday (September 2) I saw her alone (as usual) during break. I walked up and sat at the same table she was at. After a few minutes, we started to exchange glances. I didn't have the courage to start a conversation, but suddenly she stopped looking at her phone, looked backwards, then opened her purse, closed it, and then she made a gesture to me come closer to her. She asked what class I am from, and then we start talking (just a few questions, probably 3-5 minutes of conversation with some awkward silences). She said all her friends left school and will probably leave too next year. So maybe she spoke to me because she was bored? Probably because she wants to make friends? Anyways, she smiled. The thing is: there is a week break because of holidays, so I won't be able to see her until next Thursday (09) I can't wait for this day, but at the same time I am very worried: what if she forgets about me (I didn't take her number)? We are very shy and we are both awkward with small talks, so how can I build a relationship with her? What if she didn't like me, even though she smiled? If she comes to school this week, should I sit with her again, or would I be bothering? What is my next step?
My crush (15) spoke to me (16), but what now?
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