Her pain abdomen can be due to antibiotic usage.
It can also be due to worm infestation.
You did not mention about Plain x ray
abdomen and ultrasound
abdomen.Please go for these tests if they were not taken.
Please give antispasmodic Dicyclomine
till the results of the tests come.
If you come back with above reports,i will clarify further
Wish her good health and speedy recovery