what food to be avoided and should be eat

my daughter is 12 years old 5 months before she had this rashes and abdominal pain we consult doctor he tell to take blood test ,urine test, full day urine test , abdominal tell and many test and he confirmed i have HSP and he give me allerku sachet for 6 month and orokinase tablet for 3 months no rashes are found in my hand but after 3 months some rashes are in my hand what food can i avoided and what food should i eat