Congrats on your new family member and thank you for all that you have done for her. As for bathing her I would try a waterless shampoo. It comes in a foam that you just rub on the coat and let it dry. It works great and takes only a minute. This could work untill she trusts you to actually bath her.
I've used this one with great results.
Miracle Coat Foaming Waterless Dog Shampoo