Interactions with W look great defacto, keep up the great work. That allegation she's made is tough with the situation you're in but I think your doing the beat you can. I can understand thinking it may be her justifying things that have happened. You atill validated her concerns and told her professional help would be needed. I'm not sure you can fully apologize for something that may or may not happened but you are respecting the fact that right now she has those feelings and aren't discounting them. In the future if things do change it can be something that's looked into deeper with help.
Accept what is, let go of what was, and have faith in what will be