Don't be afraid of giving her medicine (HUGGS)
Babies can get fevers for no reason at all, or it could be virus or her tonsils.
My daughter gets very nasty temps, ESP with tonsillitis, but it is safe to give them panadol, then Nurofen two hours after, then panadol two hours after the Nurofen and so on.
I find fevers worse at night because the panadol/Nurofen isn't given regular over night, so set your alarm and give her a dose in the middle of the night X
If after 24hrs she is still getting a fever, take her to get checked out again, just remember go back to basics, loose cool clothing, fan in the room or a tepid bath x

Temps are scary, I hate them!!! X
Big HUGGS, I hope she is better by tomorrow, and have a lovely Easter Break