Do I need to change my diet?

My baby is 2 weeks and 2 days old. She is strictly breastfed. I brought her to her pediatrician today because she has been dealing with acid reflux since a few days old and symptoms haven’t improved even after trying their tips and I was worried she’d start to lose weight soon. She already was on the lower end of the “normal” weight gain for newborns. When examining her, we saw her doctor’s partner who said I need to cut dairy out of my diet because I am causing her to have colic. But I’m trying to research colic and my baby doesn’t match up with what I’m gathering colic is. If anything, part of my concern with her acid reflux was that it’s getting to the point to where she is the total opposite of what colic sounds like and doesn’t cry to eat or anything most of the day and tries to sleep through the night. (I’ve told them that too). I don’t indulge in dairy or anything, but I do like a little bit here and there and don’t want to have to do a diet change if it’s unnecessary