Recognition of her efforts seems enough to appease the sand cultivator. Knocking isn't really that hard, and her eye roll says as much; but it's true that neither of them are technically barging. And so long as there's credit where credit is due for the important part (and also her manners), then the ghost is forgiven. His friend is still treading on thin ice, though.

The curse thing also sounds plausible. There was a lot of things that curses could do if the cursemaker was create enough. Disappointing that no one thought to allow her dark magic so that she could try a few out herself... That said, it also seems silly to just lay on the couch and live with curses. "Have you tried emptying the water out of the room? Or installing a drain?" is her helpful suggestion. "Or are you intending on just living in a damp room forever? They'll probably kick you out if you keep flooding the room below, you know."