I thought year round school had one month breaks in between 3 months of school (not available in our area, just something I read). So, I would MODIFY the agreement that due to her putting him in year around school, you get 70% of time out of school . I would request 3 out of 4 weeks. And if she disagrees, request he be put BACK into regular school, but of course this takes another trip to court (if you go, make sure you get in front of the judge you just had!) I also suggest youpost this on Soc board for legal advice.
To try to answer question #1: From what you wrote about court, the judge told her IF she put him in private school, she is responsible for the costs. However, I believe there is an issue with the change of school schedule which interferes with your time.
#2: If you don't drive, do you really think she will get him to you? Yeah, maybe, but how many hours later? The judge will likely see this as a MINOR arguement.
#3: I believe the court already told her she was responsible, so you should be okay.
#4: Get the school schedule, it should show he is out of school 3 months total, in-between "semesters". He won't go to school 12 months out of the year.
Talk to your attorney and Soc about this. What a witch. SHe is just mad that she didn't get her way. Sorry for you and the child...nosonew