Did all the different foods have the same protein and or grain sources? ie all chicken based or all have corn?
Have you tried a grain-free food with a novel protein source one she hasn't had before? For example Orijen 6 fish etc
How are her morning poops?
Is she getting any treats in the evening that she's not in the morning?
Avoid biting when a simple growl will do
The Spirit Lives As Long As Someone Who Lives Remembers You - Navaho Saying
Vindication ~ For all those pets who became sick or lost their lives from tainted pet food