Thanks for the question. It would be good to know if this is episodic but recurrent cramps or she is getting them as continuous pain. Also if she has hard stools or loosemotions recently. Well intestinal infections or worms are very likely. Kindly get ultrasound abdomen done to localise any problem like obstruction. Give her syrupondansetron for vomitting if any. Also you can start oral rehydration solution as she looks dehydrated the way you have described about. Pediatric surgery opinion is must after ultrasound. You can try single dose of syrup cyclopam to alleviate pain but not to be used frequently.