Hi Erin,
My mom can often be a large trigger of my too. I love her a lot, but the way she breathes really loud or eats really bothers me. Thankfully my mom understands. What we do uasally is watch tv while eating. The tv will often drown out trigger noises. If your mom dosent let you watch tv, maybe play music in the background. While your eating concentrate on the music in the background.