If you want to shoot your shot again, knowing that if her feelings had changed she probably would tell you, right?- go ahead but I don’t think it’s likely her feelings have changed at all. She’s probably thinking, “Brian gets it, I told him I don’t like him, and he understands, he’s a safe male friend.”
Your admission will ruin your friendship with her, which may be inevitable anyway. I don’t know if it’s worse to have your platonic friend try to hit you up again after you’ve turned them down, or to pretend to be her friend when you really want a relationship and sex.
You should probably cut this friendship loose.