The "But he was so good to my father..." line set off such HUGE alarm bells, even before Lucy chirpily said "I made my choice...didn't I, Harry?" that I had to do something about it.

Imho, Lucy is terribly nuts in that frighteningly functional sort of way. I'm sure a messy and unpleasant ending awaits her next week, but I'll enjoy the character while she lasts... ;)