Well, your daughter is completely awesome. You guys know better than I do about how she'll do in a house full of gamers and a few pooches. Just be aware that we're not child-proofed -- not that we have tempting forks hanging out of electric sockets or anything, but you probably wouldn't want her to wander freely without supervision while you were both gaming.
Hotel-wise, we're in Newton Center MA. I'd suggest pulling up a google map and typing in "hotel". (If someone does this, please post any price info you come up with!) Also check for bed & breakfasts; I seem to remember that there's one nearby, and it might be nicer and less expensive than a hotel. Another option is staying in a nearby town to get better hotel prices, but I'm sort of ignorant on that count.