Welcome to HealthcareMagic. As you mentioned, your daughter having rashes in her mouth and few over her body, they might be related to measles, else chicken pox
rashes or a mononucleosis
. A simple viral exanthem
might also present in same manner.Are the rashes accompanied by fever, as most of them do have fever as presenting symptom. And also look for lymph nodes( palpable soft masses) around neck area, above clavicle
etc.It ia rather advisable to take your kid to a paediatrician and get it checked.Wishing your kid a quicker recovery.