I'm not sure "poaching" this the right term as this sort of thing happens all the time, but it's certainly good for Vertigo. She's been involved with some very good books at Marvel, so it will be interesting to see the books she'll be developing without the overarching universe attached.
This is great news for Vertigo fans. Not so great for Daredevil fans, I guess (although I'm sure Marvel will find someone else).
Dc would need more editors like her. Even more than Vertigo.