Based on your query, I think she has caught an infection, more commonly a virus infection (leading to cold).
is anti-fever and painkiller medicine. It can given maximum 3 times a day. I hope you've read the package insert to find out correct dose for her.
You can try Calpol
containing) medicine for fever along with motrin.
It is very crucial that she keeps drinking enough milk and some other food during illness to prevent dehydration
and getting weak.
As the symptoms have been ongoing for 2 weeks and fever for 4 days, I would advise to get her checked over by a Pediatrician
. I don't feel there is any relation from bump to her head and current symptoms, it just appears to be coincidental.
Dr Tejas Shah