Pearl seems to have a hard time physically containing emotions (or controlling them at all). She shakes when she’s angry or really happy, does that spontaneous twirly thing when she’s gushing about the strawberry field. Then there’s the end of “So Many Birthdays” where she can hardly function when distraught.
"I’m putting the Elder Wand back where it came from. It can stay there. If I die a natural death like Ignotus, its power will be broken, won’t it? The previous master will never have been defeated. That’ll be the end of it. That wand’s more trouble than it’s worth. And quite honestly, I’ve had enough trouble for a lifetime.“