Standing at the heels of the person in front of them in line.

I'm in line at the Costco pharmacy with my boomer mom. She's the least worst of boomers, unless we're standing in line. She wants to be INCHES behind the person in front of her. I've explained airborne illness, personal space, my own claustrophobia... None work. I've resorted to gently pulling her back towards me by her hoodie. She still inches forward even if the person in front hasn't moved. I love her, but boomers gonna boom, right?