Why does she try to get my attention, but rejects me when I ask her out?

Jokerghost
I kinda have this crush on this girl. She's 24. (She does happen to date older guys)

I have known her for about 4 years now, and have met her a few times in person. We practically talk like every day on social media.

She'll message constantly on, WhatsApp, Facebook, Instagram, if I don't reply to her messages. (I'm currently at uni at the moment, so usually busy with assignments etc).

Sometimes, if I ignore her, she'll ignore me the next day. I recently asked her out cause she's been dating douchebag guys that have treated her badly, she kinda wants the same thing as me - serious relationship. (We've both been messed around in the past)

When we talk, she'll tell me about her day, sends me memes she likes / finds funny. Sends me screenshots of messages of family and friends. Sends me cute pictures of her cats. Opens up to me about her personal life. She'll help me with uni assignments on the odd occasion when she can. Offers me advice when I need it.

She's quick to reply to messages. Sends me selfies of her. But the thing I'm confused about is that she said she didn't feel the same way, but doesn't like it when I mention dating other girls, as she'll act jealous, asks me more information about the girl I'm going out on a date with that sort of thing, then ignores me.
Why does she try to get my attention, but rejects me when I ask her out?
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