If she ate sesame seeds, or small nuts or seeds in tomatoes,
see if you can rule out Diverticulitis, this is inflammation and infection of the intestines food gets into pockets of the intestines causes pain on LEFT side, sharp pain, needs antibiotics. I didnt know tht eating healthy to lose weight would bring this on, ended up in Emerg Hospital for 5days in Antibiotics. turns out my grandmother had it, my sister was misdiagnosed by 2 or 3 Drs , one , her own Gynocologist, she spent 3days in emrg bfore being diagnosed with Diverticulitis. 3weeks ago, my mother thought she had the flu, and she had eaten a bunch of small sesame biscuits, and had sharp strong Pain the next day, this is what it is. Its also VERY COMMON. check that out.Often mistaken for Gynocological issues.
A hot water bottle may help with the pain--some. I really don't know what she should do next, but hopefully my comment will at least help to bump your question back up to the top and someone who knows more might be able to help.