Try to slowly reduce hear fear by filling the tub, placing some toys in it and letting her stay outside and play with them. after a few days, she may want to get right in. you can also make a game of having her stand in and empty tub why you count to three, then remove her. Have her stand briefly in the tub, or put a few inches of water in the tub and sponge her while she stand up. Keep all these attempts shorts so you can move her and out quickly.