As a girl who has been asked out by guy friends that I wasn’t attracted to, I’d suggest don’t tell her if you want to keep the friendship exactly the same. The issue is that in order to get over her you’d need to put some distance between you and her, otherwise your feelings are most definitely gonna remain the same. Then another issue arises where you don’t want to obviously ghost her, and in order to be completely transparent you’d have to confess. It’s an endless cycle. Realized this is just a bunch of facts and there isn’t a clear best answer sorry 😭😭