How would you handle this somewhat delicate situation (see details)?

A couple has two daughters, and so do you. Your oldest is best friends with their oldest, who is well-mannered, sweet, funny, and your personalities just click.

The younger one has terrible manners, has a habit of going in your bedroom, has broken your things previously, and simply drives you batshit insane, but every time you invite your daughter’s bff over, the younger sister stands with her face in yours and says, “I wanna come too, I wanna come too, can I come, I wanna come, I wanna, can I come, come on I wanna come too…” (And that’s NOT an exaggeration!)

Do you just ignore her behavior when you invite the older one over?

Do you gently explain to her that she wasn’t invited, and her behavior is really rude?

Do you stop inviting the older one to prevent hurt feelings? (Even though it’s your daughter’s bff?)

Do you worry about hurting the parents’ feelings because you never invite their younger daughter to spend the night with your own younger daughter?

Do you quietly tell her parents that you don’t like inviting her over because of her lack of manners and the fact that she snoops in your bedroom and breaks things?

I’m at a loss here. Today I said, “Not this time,” which is what I say every time, and I feel like that’s not going to work much longer.