Raril's 150th Birthday Bash

[Reinholdt]

Ilpholin nods. "Yes. Some subsection of hell. Or summoned from some planar equivalent of hell that they don't call hell but really it's just a different kind of hell. Or spiritually corrupted on earth into a hellspawn."

These are all very much not specific answers that suggest Ilpholin does not actually know where Lillith came from and is making educated accusatory guesses. But she's willing to listen to Zee explain it in more detail. Perhaps she can find a weakness through this knowledge she can use to handle the problem later.
...
Even if Lillith did set up this great party for her dad and maybe Ilpholin shouldn't murder her.