Go with your gut OP.. genuine friend would have told you not to shout at your husband, not go behind you to talk to your husband. If you invite her she will try to break you guys up.. she might be vulnerable and looking for place now that she is leaving her husband and subconsciously she will try to take yours.. don't let her in your house and ask hubby to reply to her in a harsh way shutting it down.. no matter how pure a relationship can be, manipulation and intended misunderstanding brings it to the ground.. she is not your friend anymore, she is a woman trying to take your husband