One more question, do you have the intention to take things with your friend to another level down the line? The advice I gave earlier I gave with the thought that all you wanted from her was friendship. Putting friend in quotation marks in your last post makes me wonder.
Honestly if you intend to be in a realtionship with her down the line when your SO is more comfortable I wouldn't hold my breath. If there has been a breach of trust with this specific person it might not be the best idea to go there again.
Everything will be ok in the end. If it's not ok it's not the end.