I'd say that maybe get another more experienced rider just to get her going, and you can also ride as well. It should not be a problem at all with getting her going.
Then the thing with your husband. I can understand some horses do have phobias, but you must do everything in your power to get her in harmony with your husband. Ask him to come everyday and just spend some time grooming her or something. You HAVE to get her to overcome this problem. It will be wise, because what about male vets or something like that.
If you can, while you are leading Molly let your children just get on her back, so she can get used to them and for your children to also get the feel of her. It is important for that bond to form, especially with her being a rescue horse. Sometimes they just need that little bit extra. = )