Um...if you remove her feelings from the equation, how often would your husband normally call? I don't know any grown, married children who need to call their M. every day because she demands it. I don't think it's healthy that she is trying to remain so close and involved in everything, especially when it sounds like it's not at all helpful. It sounds very manipulative and controlling.
If it makes you feel better, I can relate with my MIL. She is a tough one to get along with because she's so narcissistic. The world revolves around her and her needs. My (now ex) SIL couldn't handle her for a few weeks. They ended up in yelling fights and hating each other. My MIL's SIL did the same thing. It ruined their relationship. Point being, this woman is a challenge!
My MIL/step-FIL demanded of me that I call them with all of our family updates and that my MIL is not going to be reading my blog. I have a large family on my side, so I use the blog to keep everyone updated. I simply don't have time to call everyone or email them separately. I hardly have time for one phone call these days! Our daughter has a life threatening disease, so it's the easiest way to keep everyone updated on her. ANYWAY, my MIL used to read my blog and then for whatever reason, she decided she should be called about everything...all tests results...dr visits...everything we put on the blog. (I really am telling you this for a reason!...hehe).
Another reason we use the blog is because all of this is quite emotional and difficult for us, and we can't repeatedly tell people test results. It's TOO hard and stressful for us to say the words repeatedly and then it's hard to deal with their reactions. Using a blog helps resolve the stress of that. Plus, MIL makes it all about her and how hard it is for HER when we call her to tell her things. She offers no comfort or anything to her son. It's all about how hard it is for her and then it feels like we're supposed to tell her it's okay and comfort her through it since it's clearly so much harder for her than for us! (roll my eyes...and I don't mean to downplay her stress. I know it's hard! But she's not the only person in the world. A mother should comfort her child, not turn it all about her.)
So, we have blatantly chosen to not call her with these things. If she didn't have computer access, that would be different (slightly) but she has an iphone and her own laptop. We've told her that we'll be updating her about things like we do with everyone else - email/blog. It turned into quite a heated "discussion" between her husband and I. He was adamant I call her about everything. I told him that it's how I do it with my M./sisters, so it doesn't make sense to me to make an exception with her. He kept telling me she was "special" and apparently so important that it should work how she wants. When it ended, he said that she was not going to be reading the blog. So, if we want her to know anything, we have to call her. So, we don't call her. Does that sound mean? I don't know if I've explained it well, but when people are manipulating me/hubby, we don't participate. My MIL is true to her word too! My daughter has been in bone marrow failure and on blood transfusions, and she refuses to read the blog to update herself. It's AMAZING to me how stubborn people can be in trying to get their way. (If she were a "normal" person, I would call her and tell her things. But she makes it SO much more stressful that I can't handle her stress in addition to it all).
I see the same thing with your situation. There is absolutely NO reason you need to call her at all except for when/if you want. If she wants to know if you're okay, she can email and ask. Then when it's convenient, you can verify you are alive. She needs to step back and let you guys be. And, who cares if you move away to live with your family. I understand it can be disappointing to her, but it's not her choice. You are adults. You should do what you feel is best without worrying about her. I know that's easier said than done! I have felt so much stress over my MIL. It's frustrating and not right when they butt themselves in so much and try to control things. DO NOT LET HER. It sounds like you are a reasonable, kind person and that you'd be more than willing to have a normal relationship. What she wants is too much.