I hope the GP gives you some input that allays your fears. I (among everyone posting) understand fully it is an anxious time when your child is unwell, and of course there are cases (v v v v few) that the parent knew better), but I think the symptom that is worrying you the most is her fever. My DS has had various issues, lots of surgery, and rushed into A&E countless times - the fever you need to get under control - you need to give ibuprofen every 6 hours (Max 3 doses) PLUS paracetamol every 4 hours (max 4 doses). Do not skip the doses at least for 24 hours.
The doctors will then be able to assess whether her fever is able to be reduced (or not). If you aren't using both, they'll simply suggest that. So do that straight away when doses due. I always start dosing with both at the same time, then follow the 4 / 6 hour doses therafter. But dose according to what she's had.
DO NOT GIVE EXTRA DOSES OR MORE THAN THE MAX DOSE PER DAY that is obviously crucial!!!
Once on top of the fever, calmly assess how she is - is she eating? Is she drinking? Is she sleeping? Is she seeming her normal self? If once fever is reduced, then if she has any of the cautionary symptoms (check NHS website) then call 111.
Fevers really can last several days - they are actually a good sign - they show that the body's immune system is fighting back. Many doctors even disagree about needing to reduce fever.
Caveat: I am not a medical professional, just a mum who has had this advice (& followed it) many times.
Obviously, if your anxiety is not settling - I'd say call 111 instead of A&E - they will always err on the side of caution.