
I waited until it cleared up completely, which was about six weeks to eight weeks. I then put him back on normal complete food. I wouldn't worry about the vitamins and stuff for that short period. The meat and veg will give her some anyway.
It was trial and error with going back to the complete, Eukanaba and Hill's didn't suit him. I started off with Naturediet which is an additive free moist food, now I can feed him on either Royal Canin, Pro Plan or Nutro. He is actually fed on Royal Canin now, only because my other dog looks so good on it.
But you must clear the problem up first before trying other foods, otherwise you won't know whether it is the food causing the problem.
You will only have to try it for a couple of weeks, if she shows signs of improvement then continue, if she isn't then I would say it will not work for her.