Depends what the actual problem is, does she reciprocate those feelings? Have you told her? Are you scared to tell her in case it damages the friendship? Is it the concern that if something as natural as attraction is enough to damage a friendship, what kind of friendship was it?
I suppose all I can say is that she won't know how you feel unless you say so, but you have to be prepared for the possibility she does not, at least currently, feel the same, and be prepared to carry on as a friend if that is so.
Ask her out, if she says no, move on.
Otherwise this will turn into a creepy manic-depressive thing and nobody wants that, least of all you.
If you've already been 'in love' for years or whatever you need to get this over with since it's either going to work out really well or really badly and neither one's going to be improved by sitting and letting it fester.
Yeah, I plan on asking her - with risking damaging the friendship (Although I fear that the effects the current uncertainty is having on my persona might just be damaging the friendship even more...) - and off-course I want to carry on the friendship. The thing is, that is actually what I want. This love makes stuff needlessly complicated 0_o. She already asked me to go to the film with her, although nothing should be read into that (she is a frequent movie goer). This was after another friend remarked that a lot of boys are after her (two), and when I told her that I fully understood because she is a great woman. But again - nothing should be read into that.
The thing is, soon as I want to ask her, my autism kicks in and I shut myself down out of the fear of getting into a new, unknown, situation (I actually turned down a really great chance for romance that way, a move I have regretted ever since). It is a lot easier on paper then it actually is. I am not particularly afraid of asking - I am afraid of what might happen afterwards - And it would be a relief to know that she does not love me, just because then I can move on, whilst when she feels the same way I wouldn't know what to do with it. She knows that I need guidance (I was actually suprised she mentioned that once - usually it takes a team of psychiatrists to inform people...), but then it feels as if I am more of a burden...