NO GIRL sits like that, ever .... ONE leg up and under maybe, but not both like that.
She was asked to move out of the shot and the photographer published the uncropped photo.
You actually have to explain something so simple to the snowflakes on FR sometimes.
I think in one of the British Newwspapers, they show her getting in position to take a picture of the group. I do not think she was sitting there in that position for an extended period of time to surf her phone.