My friend thinks her gall bladder is causing her to have bad gas, could that be the problem?

Yes it could be: The problem, but usually gallbladder problem causes pain in the right upper or mid upper abdomen, after large or fatty meals, with radiation to tip of shoulder blade, and lasts 6-8 hours. But those are classic symptoms, and each patient has different symptoms. The only way to know for sure is to get tested. She should ask her doctor if she needs further tests.