You say she still sits on your finger and hangs out on your shoulder. So she still obviously has some degree of trust. What's done is done. Not to say you shouldn't feel guilty about it but personally I think the best thing to do is move on...start over. Just continue to talk sweetly to her and interact. Dully used to bite me all the time and I would just firmly say "no biting sweetie", not loud or mean, just kind of like in a mom's voice so to speak. And she doesn't bite me anymore. We are still training but I think for the most part she knows I'm not a threat. Every bird is different so it may take a while, it may not. Just be as patient with her as possible. You're at her mercy now so I definitely think you have some major sucking up to do!