Hi , I am Dr.Kadhir,
The symptoms what have you mentioned correlates with a kind of viral fever with rash
It could be a mild form of measles
as the rash occurs after 4 days of fever and also it starts from face (but rash usually occurs when there is fever) which is quite common in previously vaccinated kids.
It can also be sixth day disease (Exanthema
subitum) , in this case the rash stars from the body and not the face.
In both the conditions there is no specific treatment and the child gets better soon.
But one more possibility is dengue fever, here the rash starts after the fever on he 5th day and usually starts from the lower limbs and hands. but the child looks to be sick even without fever.
So it is very important that you show her immediately to a pediatrician
if she is sick. this is because dengue fever requires close monitoring and adequate hydration.
Thank you for your consultation in health care magic.