At first I thought this might be someone you'd want to be in a relationship with. But if she's on the other coast, that's different, unless you're willing to move for her.

Has there ever been anything sexual between the two of you? If not, I fear you'll risk alienating her.

There have been questions like this before - though usually it's "How do I tell my wife or my girlfriend that I have a hair fetish?" In those cases, IMHO it's best to show them how much you love their hair -- nuzzle her head, tell her how soft and wonderful her hair is. If she's blowing you, play with her hair, make it fall on your stomach or legs and comment on how wonderful it feels. Lead her to it rather than say "I want to cum on your hair".