My Daughter Has Exzema, Allergies And Asthma She Has Been

My daughter has exzema, allergies and asthma she has been saying her side hurts so she went to the dr and they said it was her kidneys to eat more fruits and veggies and less fried foods and now she has puss pockets on her tonsils and they are treating her for strep could the 2 things be related, she has seen a endocronologist for a few years because she cant gain weight without taking medicine could their be a deeper underlying issue