Well, the other angle could also be she hopes they actually mingle/grow close to the community so they have a stake in it (ie, people in Rick's group hook up with people in the Safe Zone), in essence making them part of the "family". But ya, the fact they are all essentially a family does make potential control easier, even if the control is subtle. You have Michone who -really- want something like this and I'm sure Gabriel and Eugene will actually feel useful since priest and tech geek have limited functions out on the road, but serve some purpose in a town like this.
Btw, I saw this posted elsewhere, but the comic book Carl picked up had Wolf in the title and that girl who was sneaking out owned the comic book. Wolf group spy (the dudes that carved the W on the people's heads at Noah's own town)?