What Could Cause Pain In Left Side Of Stomach?

My Daughter has complained of stomach pain off and on for a about a year but now major problems, then at school she was bent over complaining of left side pain , She is hard to diagnosis cause she tolerates pain very well, she has had catoract surgery this year, teeth pulled due to infection in gums (who brushes her teeth well with moms help) not due to diet... complaining not one time right back to school with in a day. I also lost a child previous to her birth she lived for 3weeks with a dyphramitc hernia (spellings off sorry) i klnow that chances are rare for that and shes been to a heart doctor at birth and was fine but should i be concerned....? Also some one asked about diabetes since shes had some many issues with tummy pain eye problems , teeth problems and urinates alot....any answers