If she got surgeries on the appendix, that means she probably had appendix disease that need to surgery back then and it still leave any residue on there if not taken cared entirely.
I already had 2 appendix surgeries when I was child, 1st one when I was on 5th grade elementary school while 2nd one was 3rd junior highschool. The 2nd one was ruptured so badly which almost cost my life if I dont get surgery in 2 hours later due shocks are very painful and I cant even breathe at all.
Whether you believe me or not, I had both surgeries mark in my body and 2nd one was very nasty that my entire belly cut in half for cleaning those ruptures.
Luckily, I dont need blood transfusion because I just lost blood about 300cc back then and I need hospitalized about 6 days and leave from hospital on next day.