Hi M., I've been there myself. Mine ruptured at that age. The best thing I can do is tell you how I did. The pain would come and go for about a year or so. I can tolerate pain more than most, so to me it wasn't that bad. My mom thought I was going to start my period. After supper, one night, I didn't feel so well. I went to bed at 8:30 P.M. It was close to midnight when I woke up cramping real bad and felt sick at my stomach. I vomited and went to wake my parents. Mom got up with me & she said I was white as a sheet. I kept vomiting every few minutes for about an hour & a 1/2. By then, mom said she felt like something was wrong. To be honest, I was scared myself. Mom stayed home with my sisters, while my dad took me to the ER. This was back in '85. I was so exhausted & out of it I barely remember vomiting all the way to the hospital. Dad told us that I vomited the whole time until they put me under for surgery. Your appendix is on your right side, but when my pain first started it was on my lower left. Then it gradually moved up toward my belly button. This pain wasn't so bad. It was when it made it to the right side that would double me over in pain. If it is her appendix it may not have completely ruptured, possibly could be a tear. With her doubling over like that, I would get her to the doctor asap. It may be nothing, but it's better to be safe than sorry. Hope this helps. God Bless!