Well she's acknowledged the wrongdoing and apologized. Life is too short to make ugly matters uglier, especially if someone is trying to right the wrong. Is there any way you two can get together and talk thru these things...enough negatives...I'm sure(or I hope) she'd like to learn from this experience. You had a right to question her actions, mistake or no mistake but I think enough information has come out of this to where everything can get straightened out, right?
I wish you two the best.