Thank you for your query.
She has atopic dermatitis
Vaseline is paraffin
based and not recommended.
It itself causes these types of rash
Stop application of oil and petroleum products on the body.
Use a good quality aloe vera
based moisterizer all through out the day.Give her some antiallergic drops for a few days.
If you have any further queries you are free to consult me.
Hope this answers your query.
Wishing your child a speedy recovery.
Have a nice day.