Well that's probably not true, unless someone died in her family I sincerely doubt 'she is not interested in seeing anyone'. Most likely, she is just looking for a certain kind of guy that pushes the right buttons and in her opinion for whatever reason that guy aint you.
I'm not sure exactly what the circumstances were that led her to rejecting you and to be frank, the more detail/information you provide the better the quality of feedback/advice you will recieve.
So I'm going to do my best to provide you with some constructive advice based on two possible generic scenarios.
Scenario 1, you were out somewhere and you were trying to pick up a stranger.
You had a window of opportunity to attract her and to be perfectly blunt, you blew it. The only thing you can do from here on out is remove your emotions from the equation and logically analyse where you think you went wrong so you don't make the same mistake next time.
Remember that every rejection brings you one step closer to success, this isn't something to be disheartened about.
Scenario 2, you have known this girl for awhile platonically and you are trying to escalate your relationship into a sexual affair.
Depending on how much you value your current relationship (would you be willing to risk losing it) if you wanted to pursue a sexual affair further you would need to be unrelentless and completely self assured.
If you knock at a door long enough it will open.
Do not confuse this with being annoying and bothersome but rather pursue other romantic options whilst maintaining a regular sexual interest in her, eventually her circumstances/outlook will change and she might reconsider at a later date, either way you will not be obsessing over her as much because you have other options and when she senses other female interest in you it will raise your value in her eyes.
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