When we brought Mandy home we had a smaller "crock" style of bowl for Murphy. I picked up a set of stainless steel bowls for Mandy, and neither she nor Murphy would touch the food in them. I "think" it was because their collar tags clanged on the stainless bowls, but didn't make as much noise on the crock style.
We have since replaced the stainless bowls with crocks, and they will eat out of both sets.
Long story short-she may simply not like something about the bowls.