I applaud your willingness to remain friends with her, even though her behavior on this point reflects badly on her. Too many people these days assume that if a person does one bad thing, they are irredeemable and therefore should be cancelled in some way. You obviously have a positive history together that makes you want to overlook this rather silly vulnerability of hers--a history that a lot of the commenters here find easy to dismiss because they haven't lived through it. I don't know whether I would be capable of this kind of forgiveness if I were marginalized in any way, but I admire you for being able to do it. More people should have these kinds of nuanced reactions. You shouldn't apologize because you have done nothing wrong. But I hope for both of your sakes that you can become friends again.