About the only thing you could safely do is use humor.
Saying something like "pick a winner" under your breath everytime might give her the message.
If she says, "What did you say?"
You reply, "Pick a winner
Then you're embarrassed, but the problem is solved.
My dad is getting so stupid---er old that he many times forgets to zip up his fly. I go to my mom and put it on her; "We're having guests come over, it's your job to make sure dad zips up his fly!"
If she fails, I say, "Hey! Old man! Zip up your damn fly! Whatdoyawanna do! Make us sick?"
I'm bad that way. But that's how I roll.
Speaking of the nose picking, I guarantee about 30% or more people you see at a stop light here in Colorado will be up to their 1st knuckle everytime! This must be the nose-minning capital of the World!
Oh! How do ya make a Kleenex dance?
Put a little bogey in it.