Anyone else ever experience this?

So, this girl and I have been talking for like 2.5 weeks and at first lots of flirting and tons of talking, last week it tapered off but she is still texting me asking about my day and continuing the conversation (as in asking follow-up questions) but it does feel different.

I’ve tried to take her out on a date but she’s been swamped and she said she’d let me know when she’s free but never gave any type of idea (like hey, in two weeks it should be better).

For those who have gone through something similar what happened and what would you suggest?