Did she have fever any time?
Was she given any medications?
She might be having Gastritis. It can well be seen in many viral infections.
Try to give her medications like Lansoprazole
in right dosage for a week. This will help in reducing the acidity.
For vomiting you may give her medications like Domperidone
or Ondensetron according to her weight.
If the pain and itching in feet are persistent you might need to see your Pediatrician
All symptoms can well fit into a viral episode.
Till her activity is fine and intake is okay, you need not worry.
Give her plenty of fluids and you may give her Acetaminophen
for her pain.
If she continues to vomit- you must see your Pediatrician at the earliest- as repeated vomiting will cause dehydration
and even electrolyte disturbances.
Hope my answer helps you.
Wish your daughter good health.