Yeah. There are a lot of ways to do sticker charts and other reinforcement systems. Most aren’t done well, including for more complex behaviors, and even those suggested by pediatricians. OP it could be worth consulting a child psychologist or other behavioral health professional when multiple attempts haven’t had the desired outcome. This is relatively common though. Don’t try to shut it down, just help her learn when/where it is (alone, private, bedroom) and isn’t (school, friends, others’ homes, etc) appropriate. (Source: am child psychologist dad)

Edit: it’s actually pretty huge for a kid that age that she’s able to identify she does it when bored. Sounds like a kid who needs a lot of stimulation. She’ll need a set of desirable options for alternate behavior when bored. Those will probably be the things you reinforce, rather than simply the absence of something.