A background, via Reddit:
A little background on why she did it. she was approached by the flight attendant and she said some kids had a bong in the back, and she thought a marijuana bong. so being the badass she is went to investigate to get them to stop. well it was a beer bong and i guess they got her to do it somehow, she was tricked!
OK, so it was a can of ginger ale. But whatever. Granny funneling something on a plane. May Spring Break never end.