[souffle]

It's not really the pet shops - it is the rodent farms that are breeding the animals without consideration of their future health. I have no doubt that they are kept in good conditions hygene wise and husbandry wise or else they would never pass the animal welfare inspections but that is not what matters when they reach their pet homes. They are supplying a demand from the pet shops which know and ask for colours and patterns which sell well.
Most pet stores do keep their animals in good conditions or else people would not buy from them and remember animals are generally not in pet stores for very long.
Your little one is lucky to have you and she looks very lovely and seems healthy so best wishes for her to have a healthy and long life.