what you do next depends on what you want from the girl.
1) Do you actually like her and want to give a relationship a go?
2) Or are you just looking for sex?
(kinda difficult to give good advice because we dont have the details)
If 1, make sure she trusts you. Take a few steps back maybe, dont be pushy, and let things happen at her pace.
Pay her compliments, make sure she knows you're the one she can trust and tell you anything. Talk to her like a close friend, ask her interesting question, and stuff aobut her. If oyu see her in a bad mood ask her what's wrong and that you're always there to talk to.
Lesser touches to warm her up to you, for example lower back if you're walking together and you're changing direction. Her arm when you're talking. Then little by little you get more intimate when she';s comfortable.
If 2, it's most likely not worth that much effort...
Now, results may vary, I'm in my mid 20s and most often go for older women so I can't guarantee this will work in all cases. You'l have to judge for yourself.
((I'm taking some of these life advice threads way too seriously when they're usually trolls... but you never know it might help others.))
Good luck friend