Sam wakes up, plays it cool, and had planned for this occurrence

After a while, the **** wore off and Sam woke up, noticing two things.

The first was that her mother was still fast asleep; the slim 19-year old had taken a smaller dose of her sleeping pills and had woken up earlier. She smiled, knowing that she still got to see Joanne's eventual realization of her predicament.

The second was that she herself was now in the nude; even her sweater was gone. She was stunned for an instant, but then quickly remembered the scissors and her sister. She was disappointed that Lacey couldn't be trusted, but wasn't so stupid that she didn't plan for such treachery.

She bent over and got a backpack from under the seat in front of her. She took out a sundress and set of underwear, and making sure no one was looking, slipped them on. She then put the bag back under the seat, and noticed the drink cart was making its run while her mother was finally stirring.