Try this place. . .
https://www.facebook.com/PlanetCanineIt was recommended to us before and we visited. We ended up not needing them, but they seemed to be very reliable and good.
There are some others listed if you google doggie day care in the Elkhart area. You would just want to check them out when you come. You won't be in the campground? If you were, I would offer to check on your wee one. I love Shelties, we used to have one. . . we now have a Scottie. Most groomers won't walk your dog, so if you drop her off there for the day, she will have to "hold" till you get back.
Dale