Ive been in these waters before...
You basically have done all that you can. It's all up to her now. If she digs it, she will return your call. If she doesn't, she probably won't return your call.
I wouldn't really hold her accountable if she doesn't call, either. Most girls will do this. Most just aren't as assertive as most guys, and thus wouldnt make a return call unless she had some interest in you.
If she doesn't call back, just say "Next...", and move on. It sucks, but thats just how the cookie crumbles i guess?