Gas

I EBF my LO. She has HORRIBLE gas. She grunts in her sleep and when she's awake and a lot of time after a meal it takes her a while to settle down before sleep because she is uncomfortable. She tightens her belly, draws up her legs, arches her back, and fusses. She acts relieved when she passes gas. What should I eliminate from my diet to help this?? I thought it was dairy but even when I have no dairy she's still gassy. Unless it could take a bit to leave our systems which I'm sure it could? I've tried gas drops and they don't really help. I bicycle her legs and rub her tummy and it seems to help I just feel bad for her.