I don't care if she likes me or not I just need to tell her.
I've already done stuff like this. I asked out my friend and her parents said no. She's interested though. Nothing changed, except my friends making perverted jokes and more awkward moments. But that was about it.
If you truly worship the friendship, the ultimate decision would be up to you. BUT you said you want to tell her. Just remember to clarify that you want to continue to be friends if she says no. Schedule some hangout and tell her there.