One of my biggest pet peeves is gonna make me snap

So I work at a daycare with toddlers and my co-teacher is driving me insane. Idk how exactly to explain this pet peeve in words but it's when someone has a runny nose or a cold and purposely sucks in the snot super loud via their nose then swallows it. Like its almost a snorting sound they make when they do it followed by them swallowing. Shes been doing it every few minutes for a week now and I feel like a ticking time bomb since I gotta be in a room with her all day. I dont want to be mean or rude but should I tell her its a pet peeve or just ignore it and scream in a pillow during my break? Lmao