Now since Leia has a second BFF who isn't her brother, I can do this again.
If she woke up in Ryan's body she would definitely freak. Then try her bets to be calm, call him, and figure out together what they would do. She would totally ask him "Okay, so how do I be you?"
She would also tell him to just put on her outside clothes over her pajamas. Under no circumstances is anyone allowed to change their clothes in her body. Fortunately their grades are comparable, but her biggest concern would be Riley.
If she wasn't there to watch Riley, she'd have to inform Ryan of his secret so that he can help Riley through "the routine" to keep their parents from noticing what's up and get Riley out of the house as quickly as possible.
(this is available for free for everyone to read on my Patreon public posts