I think she was palming you off in a nice way when she mentioned she didn't want another relationship. Don't do any of the above, its a bit creepy and stalkerish.
This.
Don't waste anymore time with her and find someone else. If she was interested then she would have said yes, not given silly excuses.
......She may change her mind by next weekend!?!?!! How old is she? 14? Utter rubbish! More like she has interest in someone else or she's still seeing her ex and hope they get back together.
The amount of women I've heard say, they are not ready for a new relationship after just coming out of one, then a few weeks later they are with someone new. They are talking BS.