In a 'girl gets stuck tickled story', classmates could also be involved. Let's say they are playing hide - and - seek at school. The girl hides in a small locker to surprise everyone but gets stuck. Her classmates find her and instead of immediately helping her out, they tickle her through the small openings of the locker. After a while, they work together to get her unstuck.
Most likely her friends or siblings. They are the ones who usually engage in tickling games. They might find the girl stuck somewhere like behind a big piece of furniture and then start tickling her for fun.
It could be her parents too. For example, if the girl gets stuck in a hammock and her parents come to her rescue. But before getting her out completely, they might tickle her a bit just to make her laugh and ease her nervousness about being stuck. And of course, there could be her pets involved as well. If she has a cat, the cat might jump on her when she's stuck in a corner and start tickling her with its paws in a playful way.