I agree re: controlling the phone calls. Sometimes it's just easier to lie than to have the confrontation about why you can't be at her beck and call.

I have had to draw some boundaries with my mom over similar stuff. It was really, really hard to say "Sorry, I can't" the first few times, but it got easier. It is not quite so upsetting to me (or her) now. One thing that helps that might help you when you finish with your program is, when I decline I try to give an alternative that I am saying yes to. For example, mom might say, "I want you to come do X right now." and I might say, "UNfortunately, I can't come do X now. But this weekend, why don't I come over and do Y? I really want to see you and do Y." I may have even learned the strategy here on PC!

I hope your program is really helpful to you!!!