Awww. Barb....sorry this came up now. I've experienced the same kind of nonsense between female employees in my office. Sometimes it seems like, the nicer an employer you are, the more of this b.s. goes on.
But as for your immediate problem: do you have a friend who can come and check in on everything once a day? Or do you know a young person you could pay to "house sit" during that time? I know Josh will be around, but it would take some of the burden off of him and give you an extra pair of eyes.