Thank you for your query,
The rash could be due to Acne vulgaris
which children get during the start of their adolescent periods due to hormonal
effects on the skin.
Acne will have itching.
It is unlikely due to a viral fever
as the pimple like rash was there before the onset of the fever.
At present as there is no fever nothing to worry.
Tell her to wash her face frequently with fresh water and tell her to avoid pricking or scratching the pimples.
Trim her nails regularly.
If the pimples persisting or increasing in size with pus consult your Pediatrician
for further management.
Hope I have answered your query.