Apparently while visiting Ginny Weasley today, Honoria received an urgent owl from her brother Orion, saying that her grandmother was dying and she should come to her bedside to receive her grandmother's blessing. The owl said that Lana had already come and gone, that she'd be safe.

We found the note. It's Orion's handwriting. I'm not sure if he cooperated in luring her, or if he was coerced. Or Imperiused.

The curse is slow-acting, designed to kill hours after it was cast. If we'd known earlier When used to kill, it's frequently mistaken for natural causes, though heart failure is a thoroughly suspicious cause of death in a girl Honoria's age.

Dammit.