Friend -
If you ask her out do it because you have a connection to her spirit. Don't waste your time if there is nothing more than attraction. If you think she is someone that you can teach and learn from then go for it and see if she sees the same thing you do. My GF told me "you know we have an attraction don't you?" and I did know..that was 13 years ago...
Now...If she says no it is simply because she doesn't see the connection (and possibly never will) that you do.If she says no YOU are not rejected... it just means you need to find a way to help her open up her heart and see what you are seeing. Don't ask out her physical person. Ask out her spirit or her soul. The energy you are so attracted to. Inside her is a soul that wants to have love and be happy just as much as you do. If you remember that we all want deep connections (even if we don't realize it) You can consider yourself as giving her the chance of a lifetime to have a relationship with you.
In other words bro..Get inside her dome and Flip tha script.
Peace and LOVE -Jay