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(especially when she has already said she doesn't want anything based on time?)
Lol, that's more like, she doesn't want anything based on YOU.
But you can change that. Easily. You probably didn't get the stages of attraction, comfort and seduction right. My guess is you need more attraction.
You need to take the small opportunities you have with her, the little chats or little dances to build massive attraction, which will then create opportunities to have more time with her as she will be attracted to you and create time.
Ways you can create attraction in such a short time all centers around the golden rule: If what you're doing at the moment isn't working, DO SOMETHING DIFFERENT!
Use freeze outs. Be the social guy, game everyone else in the room. Talk and laugh with the ugly ones - show that you're not needy or judgemental. Neg her. False disaqualify yourself. Use DHV stories. Do something crazy and random, or something unexpected. Buy her wilted flowers.
Try not to care too much, because that will likely inhibit you from picking her up, as with most cases of one-itis. A good way to kino-escalate with these girls is to hit her or touch her by pushing her away. She will hit you back or push you back (this is all playful by the way), and it works and is reciprocating because you're touching her under the guise of being mean, but actually it just builds attraction.
Hope this helps mate.