Sounds nice. We have a neighbor whose kid sometimes does something a bit like this, though I am not sure of details. As long as everyone knows what's going on, seems like a good set up. I wouldn't want to fool with inviting people into my home, personally, but that's me.
I do hire neighborhood kids as dogsitters when I can, helps me and work for them. I target ages a bit older than your daughter, but with parental help and a neighbor (i.e. me) willing to work along on the hiring, I think this could work even younger for some pet- or housesitting responsibilities (watering plants, turning lights on and off, fetching the mail). I figure they've got to learn (and earn) somewhere.
