YANBU, but I think you have a problem with both your DP and your MIL.
I would be furious if my DP and MIL were discussing such personal details about me. It's really not on, and I would not stand for it. She should not be asking such personal questions (I can't imagine why she would want to know such details- is it a control thing, or is she generally a bit socially inept?). Your DP should refuse to answer these questions, tell her why and request she does not do so again. Repeat until she stops. The fact your DP even needed this to be pointed out surprises me.
If your DP doesn't want to talk to his DM every day, he ought to say so. Your MIL should respect requests from her son not to phone every day (although you can't control how she feels about this- you may have to put up with sulks etc- she is entitled to her feelings, even if you don't understand them). Your DP should respect your feelings too, but you can't ban him from speaking to her every day if that's what he wants- that would be unreasonable.
I am unclear about whether he actually wants to talk to her every day or not. Does he really want to speak to her this often, or is he lacking enough backbone to tell her no and then stick to it, even if she does throw a tantrum?
I agree it's slightly odd that she would to want to know every move you make, and I really wouldn't like it either- it strikes me as controlling. It would drive me crackers. But what would annoy me more is that your DP won't even properly discuss something which you clearly find very distressing. He may not agree with you, but he should at least talk about- hopefully you would be able to find some sort of compromise. The fact he is more worried about upsetting his DM than you, won't compromise and won't talk about an issue that is upsetting you, is the bigger issue, if I'm honest.
As for calling while you are abroad/out etc- your DP really needs to say "sorry mum, I'm busy now so it's not convenient to talk". If he doesn't do this, it's really more his fault than hers, although most people would take the hint and call back later/another day (or keep the call as short as possible if it was urgent/vital you talk) which does make me wonder why she does it. Again, I can see why you would perceive that her exerting some sort of control over her son- but perhaps it is more than she really doesn't understand social norms?
All in all- I think they are both being unreasonable, but you would be unreasonable to ban your DP speaking to his mother every day if he really wants to.