, pain while eating maybe due to bad oral hygiene
and cavities as it is difficult for kids to clean their own teeth and parent supervision is required in many cases. Bad breath
also supports this theory. Stomach upsets result in oral ulcers and as she was also suffering from fever
,which maybe due to the oral infection, i would strongly recommend you to visit your dentist
as well as physician. Once the teeth are clean and all the germs are eradicated she will be able to eat better and the bleeding along with swelling from gums will get eliminated. The doctor may start some low dose antibiotic for her if required.