The dialogue in that last panel isn’t “the thing Kale actually said” so much as “the information Tansy absorbed from it.”
Tansy: Seriously, is that someone at our door?
Larch: Uhhh . . .
Ollie: Larch! I can wait here all day, you know!
Tansy: Is that your father? How did your parents get our address?!
Larch: I swear I have no idea!
Tansy: What are we going to do?
Larch: They’ll get bored eventually! We can just stay inside until then, and we’ll be perfectly safe!
Kale: Hi, I’m a total stranger who just followed your special-needs child into your home.
Tansy: Eh? Ehhh?