Have you only had her on lamb variety or have you tried other flavours?
How long is she on a brand/flavour of food before changing to something new? and are you doing a slow transition to the new food or a full change all in one day?
Generally it is recommended to try a new food for at least a week or two unless the reaction is far too severe to continue.
A gradual food transition usually goes like this:
Week 1-2 1/4 new 3/4 old
Week 3-4 1/2 new 1/2 old
Week 4-5 3/4 new 1/4 old
Week 6 -7 all new
schedule can be adjusted to smaller increments/longer time frame as needed
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