baby gas keeping her up during naps

DD only takes 30 minute naps because gas always wakes her up. She used to take 2 and a half our naps a few times a day. I've tried 2 different brands of gas drops and gripe water - none of those works. Baby's magic tea made the gas worse. She's burped good after every feeding and we use both MAM anti colic bottles and dr browns bottles. Does anyone have any tips to get her to sleep longer? She's so over tired and cranky because she can't sleep!