Hi,
IMHO there are too many hours (miles) of driving between too many destinations. Yosemite/eastern sierra is closer to home and can be visited on separate trips of a few days. I would pick a region, southwest, Wyoming or northwest.
I suggest 4-5 national/state parks max with small town destinations in between. You can enjoy a full week easily at Yellowstone/Grand Tetons. Maybe plan a day or two at a resort campground or hotel with nothing to do and all day to do it. Let each girl plan one destination or activity on the route.
Bon voyage