Why did she agree to date me now?

[coldmarch]

I'd picture 4 possible motivations:
1) She wasn't dating you before because she had another guy in her mind and couldn't care less about considering other guys. Now that she is over her crush, she is ready to date guys again.
2) She noticed that after all her "no" you actually ignored her and got over her, so she got triggered. This happens very frequently. She doesn't feel desired anymore and you proven your value by not being desperate at her feet but you closed the chapter and moved on. This makes you appear like harder to reach now, not granted anymore, and it paints her like not an object of desire anymore, like if she has something missing to buy you completely. This tickles their ego.
3) You were too insistent, too clingy, too pushy. And she had no space to have the chance to like you because you were doing already all by yourself. By giving her space, she had time to come closer and get interested.
4) She has issues with a boyfriend or an ex and needs to go on a date with whoever guy just to feel better about that so she is picking anyone who wanted her in the last months.