Garions a really good eater but the first 3 or 4 days we had him he didn't eat real well. He would eat about half the food, now he devours it.
She may not be interested in the food either. I would suggest doing a taste test if you decide to try a different food. Go to a store that carries a good selection of higher quality foods, get samples of them........5 or 6 is usually best. Put them all out in separate bowls, bags under the bowls, and let her choose. The more samples you have the better chance of finding one she actually likes. A couple of formulas with in a brand is a good idea. I have no idea what's available in your area but maybe look for:
Timberwolf is the best but I don't know that it's available in your area
Natures Variety
Wellness
Natural Balance
Canidae
Evolve
Simply Natural
You might try adding plain yogurt, it will help with digestion and most dogs love it. Eggs are also a good addition and will do wonders for her....raw is good, a couple a day would be fine. I mix them in with the dry and stand back

. Good luck.