If it was a polite let down I personaly dont think she would have said to give her more time, that sounds like she genuinly needs it, but is interested in you in the future. Don't rush things though, you might end up making the whole getting over it process longer by reminding/ asking her too often. Try getting high with her some day, just the two of you in a friendly context and allow the conversation to flow, that way you might find out more about her, how she is getting on with getting over it and generally what you can do to increase your chances, you see knowladge is power and knowing what is going on with her is really going to help you out.
Kep on building the friendship and show her that your interested in her in more ways than just "*drool* she is totally stunning..." If you like her as a person show her you do, its all good.
All the best, and take care bro.
Peace Out:hippy: