hi well come to hcm.
could be associated with vomitting at times due to drugs and at times
due to assocated gastritis
.Headache could also be related with fever in most of the
cases.Unless you give details how often she gets this andhow long it lasts severity of
fever etc, it will be guess work only.If your Doctor has not given much importants
to it and has not submitted for any investigation there may not be any serious ailment
or at present he is not thinkig of it. thanks