"Listen I really enjoyed our time together but I feel like we didn't really vibe on a non-sexual level so I'm not sure I want to see you again. And I'm not just looking for casual sex with anyone."
She said she's "not sure" if she wants to see you again, threw the anti slut casual sex remark in there, and she's also currently on her period (emotional). "not sure" means you still have a chance with this broad, if you play your cards right.
As Guru1000 advocates, you should employ silence and distance in this situation. That is your only course of action in this scenario.
The strongest weapon in your artillery is knowing when and how to apply silence and distance (and in some cases disappearance). Girl flakes on a date. Silence and disappearance. Girl declines with no counteroffer or changes the subject in response to your date offer. Silence and disappearance...
www.sosuave.net