Thank you for your query.
I am afraid that it is difficult to say what dietary change will reduce the eosinophil count
of your daughter. If some food causes allergic reaction
in your daughter then it needs to be removed.
You mentioned that your daughter gets fainting
and stomach ache. These need to be examined by the treating doctor and, if needed, investigated. These cannot be explained by the high eosinophil count.
I hope I have answered your query to your satisfaction.
Wishing your daughter all the best.