Stupid eating question for my spider

I have been having trouble where she would strike at the food several times and then finally go away from food. It started when I tried a small rat pup she ate great before that time. It was a greyish dark pup. I tried again a week or so later same thing for 2 weeks except she was now doing this on a greyish mouse. And then I remembered the reptile store I get my live mice from usually always have just white and that is what she was eating and was started on since birth.
So I went down to store and got a large white mouse. and It worked she ate it. I just tried again and she ate it again. Is it possible for her not to like the color of grey or dark toward black? Could the rat pup messed with her mind and now she associates everything bad with this color I thought snakes were color blind. Or am I just crazy??

Assuming all other variables are as they should be (cage temps, hiding spots, etc...) How old is it and how often is she actually eating? But to answer the color question, I too have one that will only eat black or gray rats (no solid white ones and I kept trying for nearly a year to get him to eat a solid white one).