Donna, this Saturday night, wait till both of you are really hungry and then go with your friend to the busiest restaurant in town - you know, the one that doesn't take reservations and where there is a 90 minute wait. Take the beeper and actually wait the 90 minutes. That should convince her that PS is a good idea. Next, go to the grocery store or Wallmart at the busiest time of the day, and wait in the longest line ... you get the idea. No planning = either long waits, or not getting to do everything.
With that said, you may find that your friend is content not to do "everything." We have some friends with kids our kids' ages who were at WDW in early August. Day 1: MK. Day 2: AK. Day 3: Epcot/MGM. Day 4: MK/MGM. In that amount of time they had seen everything they wanted to see and had done everything they wanted to do and were ready to come home!
With that said, you may find that your friend is content not to do "everything." We have some friends with kids our kids' ages who were at WDW in early August. Day 1: MK. Day 2: AK. Day 3: Epcot/MGM. Day 4: MK/MGM. In that amount of time they had seen everything they wanted to see and had done everything they wanted to do and were ready to come home!