hi.
thanks for posting query at HCM
insufficient history provided - NO lab results,
anyhow, 
autoimmune hepatitis is usually treated with 
steroids and in case of 
elevated liver enzymes - a special diet is advised. 
Value of AST or ALT greater than 85 or above maybe investigated further.
Alcohol ingestion and obesity are common causes of 
fatty liver disease.
advice :
- rule out viral causes of hepatitis
- LOW fat diet should be followed, AVOID junk food and beverages
- decreased oil consumption (oily food)
- NO red meat
- green vegetables should be ingested daily
- use lemon juice (lemonade) once in a day
- reduce weight if overweight/obese
- pure olive oil maybe used in less amount
-"recheck liver enzymes after 6 to 8 weeks" and/or 
ultrasound.
any further questions are welcomed.
hope to answer your concern.
wish your daughter good health.
regards,
Dr Tayyab Malik