Watched her mouth - Idioms by The Free Dictionary
watch (one's) mouth (redirected from watched her mouth)
watch (one's) mouth
To be very mindful or cautious about what one says; to control what one says in order to avoid offensive language. Watch your mouth! I don't care how you speak at home, that's not how we talk here. After being threatened with detention for my snide remarks in class, I knew I had to watch my mouth for the rest of the semester.
watch your ˈmouth/ˈtongue be careful what you say in order not to offend somebody or make them angry: Now, you just watch your mouth around your grandparents, Billy! OPPOSITE: shoot your mouth off (about something)
References in periodicals archive
Presumably while people just gawked and watched her mouth