I don't think "forgiving" or "re-earning trust" should carry the expectation that the relationship will be the same as before, as if nothing ever happened- humans remember things, and are affected by things, and even if you want want want to forget what happened and she wants wants wants to forget it happened, it did happen, and if you continue the friendship, it's going to be a part of your history as friends. So I would not focus on trying to erase or forget this incident, but rather focus on whether or not this can become a part of the past in your history together, or if this is something that changes who you know your friend to be.
Things to think about: did this show you a side of your friend you've never seen? Is this a side of your friend you've seen before, but never thought she'd take it this far? Is this something that makes you question whether your friend would even try or want to earn your trust back?