My mother has a diabetic she has a 2.2 of creatinine and stomach and back pain is the sign of kidney failure and what food is better for my mother?

Referal: Ask her doctor to refer your mother to dietician, who will help with proper diet. It is very complicated to describe here.

Creatinine of 2.2: As a 10 year old girl, you are quite a good question asker. Your mother should see a doctor who takes care of kidneys, a nephrologist (n). She can have some test done to see how good or bad her kidneys work. Her serum creatinine is not much help, as you did not mention her age and how much she ways. It seems as if she has symptoms which require attention, her back pain. Have her see a n soon.