Stomach pain everyday. Or anything else.

My daughter is 3.8 years old. She complains of Stomach pain everyday around the belly button area. Sometimes she passes gas after the pain and feels better but sometimes nothing helps. I rub her tummy and she feels better but everyday she complains atleast 5 times about pain that lasts 15 seconds. She has been pooping normally for the last month and has occasional constipation but not much. Poop is normal. She was diagnosed with secondary lactose intolerance even she was two but she is sorted now. She does not have outside food . She eats only home cooked meals. Idli dosa rasam rice veg. She has one egg and one banana everyday around with a fruit juice as well. I'm not sure what the challenge is but she has not been pain free at all continuously for a few days. Sometimes she gets up in the night due to uneasiness or passes gas. She rolls around and then goes back to sleep. Can you please help and tell me if this is IBS or gas related or anything else.