That would depend entirely on her present condition. Is she still nursing, on a scale of 1-5, 1 being immaciated and 10 being obese where does she fall? When it comes to weight gain from an immaciated state you MUST build muscle since they have been robbing from that so protein is extremely important. The higher the quality of the kibble the better the protein source and the faster she will recover. If she is around a 3-4 she will need a good percentage of fat since her stores are probably depleted. Adding oil, olive, flax or canola to her food will go along way. Maybe giving her some full fat yogurt or cottage cheese(if she will tolerate it) and a good quality kibble.