"do you think you will regret it if you let her go?"

Good point. I'd rather ask and get turned down than not ask and never know. And who knows she may not even have any interest. But the one thing I forgot to mention is most of my non-work friends (about a dozen) know of my attraction and would be very supportive and understanding. So while I may possibly lose friends at work even for just asking... if people found out, my main social group would be fine and stay intact.

Thanks everybody for your input