Up to 3 bowel movements per day is okay if the consistency is normal.
How ever if the consistency is loose too- it might be due to the antibiotic she was given.
Gas might be due to the formula.
You may give her probiotic
sachets like Econorm/ Bifilac- about 1/2 sachet twice a day for 5 days.
Include plenty of curd in her diet- as curd contains probiotics naturally. It will help in restoration of the normal gut flora
which might have been destroyed by the antibiotic.
Drops like Colicaid will help her gas trouble too.
With this she should be okay.
At any time if you feel she is cranky, you see blood in stools , she develops high grade fever
or she refuses to drink- you must visit your Pediatrician
Hope I have answered your query.
Wish your daughter good health.