The presentation which you are describing regarding your daughter can be simple viral fever
and presenting as fever and breathing problem, but if the severity of fever and breathing problem is more and is not subsiding after 2 days and she is also having runny nose with phlem, than it is good that you consult some doctor to make sure that this is not pneumonia
and there is no need of antibiotics.
Some time it happens that simple viral fever can progress to pneumonia, some time due to complications of viral fever only.
So, it is good that you have a consultation with doctor to make sure this is not pneumonia.
Thanks and take care