She doesn't know!

Mark and his camera spotted her before Abbey, as Jenna came charging past a lounging couple and a dog walker.
As Jenna spotted the enthusiastically waving teen and approached removing her earbuds.
Abbey began to gush verbally as soon as Jenna was near enough to talk.
"Oh my god, you are so brave I can't believe you're..."
Jenna cut her off... "Thanks dude, glad you came out; but come on I really can't be late, we'll talk after!"
Mark stayed silent a few steps back pretending to take pictures of the lake but keeping the girls in frame the whole time.

Jenna's crew arrived just a few minutes late even still. The batty old mystic of a professor scoffed when she saw Jenna arrive. The 40 something fitness and yoga instructor was just about to hit play on her boombox having already finished welcoming the class and thanking them for coming out at 7:30 on a Saturday morning. When the naked coed power walked up. The scoff turned to a sneer when the proud green hippie of a woman saw the disposable water bottle in the girls hand. Truth be told she didn't really like Jenna's consumerism basic highschooler attitude. The educator had been given nothing but attitude and challenges from the image driven former cheerleader who didn't want to be healthy instead wanting to work out to look attractive.

Oh look, she even brought her own camera crew...
Begrudgingly marking her as present and with extra credit for bringing a friend she motioned for Jenna and Abbey to grab some spare yoga mats and join in.
They quickly found spots next to each other in the back corner of the 30 some odd group of mixed gendered students, facing the instructor and treeline with their backs to the street.

'Well if the girl wanted to show off' thought the professor 'That can be arranged...'