I am an old fuddy-duddy.....
I thought that was the 'call me' sign....
On a serious note though...
Since she is rural, she and schoolmates probably
got the sign from facebook or similar....youTube....
And most likely doesn't realize what it really means,
and that's what a parents job is, to teach them
before
they leave the nest.
It's like wearing your pants down like a soggy diaper......
if the kids [adults] knew what it really meant, most of
them would not do it.