Don`t panic. Calm down, be courageous and get her treated.
You should get her evaluated once for her complaint to get her examined physically by a pediatrician
for proper diagnosis.whether it is allergic,viral or bacterial.
Under doctor supervision you can start medicine,local application.
I would advise:
Keep baby dry after bath.
Do not apply any lotion/cream etc
You can use cotton for mobbing leakage.
I hope I have answered your query to your satisfaction.
Wishing your child a speedy recovery.
Regards; Dr Sagar Mhatre