Hi.
 Thanks for your query about your 7 year old daughter. 
History of asthma and treatment and present complaints noted. 
The commonest reasons for pain in abdomen and regurge in mouth or 
vomiting are as follows:
-Tummy tonsils- meaning enlargement of the lymph nodes of the abdomen.
-Appendicitis- by default this has to be ruled out in every case of pain in -abdomen of a child.
-Worms.
The best diagnosis is a high resolution 
ultrasonography. some blood, urine and stool tests.
A therapeutic trial with a course of an antibiotic, 
metronidazole and probiotics under the guidance of a 
pediatrician / Surgeon always helps to solve the problem and to get a diagnosis.
Also given is a dose of medicines active against worms in intestine.
I hope a consultation with a Pediatric Surgeon, investigations and a course of an antibiotic and metronidazole should solve the problem.
If this is indicative of appendicitis , please go for the surgery of 
appendectomy.