Is Cher supposed to be a senior?
I'm assuming she's at least 17. 16 at the least.
She can't be younger than 16 if she's learning to drive.
So how old and what grade is she in?
I don't know what the driving laws are like where you live but where I live and in a couple of other states I know of, you can get your learners permit at 15 or 15 and a half and your actual licence at 16.
However, if I remember correctly it's stated that Cher is 16 so that would make her either in 10th grade with a birthday really early in the school year or in 11th grade with her birthday in the middle or end of the school year.
Once upon a time there was a magical place where it never rained. The end.