DD had them last winter. They were on her back, tummy and in her groin area. She only felt bad one day. We gave baking soda baths and put topical bendryl on the pox. It's the same virus so shingles exposure can result in chicken pox. On the bright side, your girls are very unlikely to get chicken pox as adults when it is more dangerous, and you homeschool, so you can just apply benedryl and carry on.
I'm sorry you are going through this, though.