Hanover is two towns away, so 5 minutes is an exaggeration. I have no idea if she has two houses, but in The Vanished podcast she says she lives in Hanover. It's probably a little after 7:30
EPISODE 269: Sandra Crispo — The Vanished Podcast she says "We lived in Hanover and they lived in Quincy, and we had a summer place, a summer cottage. So, like in the summertime my mother would go pick up her kids, Linda and Sandra, and get them up and then bring them down to the cottage, because we used to live on a pond. That’s where I live now." Oh wait- maybe she lived in Hanover but the summer cottage was not necessarily in Hanover. Plymouth definitely has tons of ponds.
Did searchers only search ponds near Sandra's house, or did they also search any ponds near family's houses as well I wonder...Though I doubt she's in a pond because I feel like she would have been found by now if that were the case...