Unless you do a lab stomach pain does not indicate appendicitis
To many, ‘stomach pain’ equals ‘abdominal pain’.
My rule of thumb is that if someone has abdominal pain and an in situ appendix, appendicitis goes to or near the top of the list.
As far as wondering if the patient is faking it or embellishing symptoms goes, an abdominal CT is a good idea, even in young women.