So, for all those curious, I finally told her.
It got delayed a few times because of general stuff going on in her life; I didn't want to throw that at her while she was overwhelmed with university and other drama. Today was the first day she was really clear, with nothing on her plate. Awesome.
It went... really well, actually. She was flattered and gratified, made it clear she did not presently reciprocate, and we had a very lovely conversation on the subject before moving on to other things. She took the whole thing completely in stride, and said she was very glad to hear it. All in all I'd call it a solid success and I can now move on with my life that much more easily.