My 4 Year Old Granddaughter Has Had For Quite Sometime

My 4 year old granddaughter has had for quite sometime now and apparently with 6 dr visits so far no answer for what she has. symptoms Extremly itchy rash over her body, to include scalp with hair loss by the handful, has been diagnosed by several drs as atopic dermatitis, excema, scabies,and treated with several topical medications, antihistamine Zyrtec liquid Claritin liquid she is currently taking eledel and a topical cream, pending the dermatologist scrape findings. We are so confused at this point and she is in constant itchy pain.