I'm having real trouble trying to have an enjoyable relationship with my DM...
I have a 6 month old DD who she absolutely adores, my DM takes care of her once a week for me so I can catch up on household chores / food shopping etc. She also facetimes everyday to ask how DD is - this is another overwhelming factor that makes my life difficult because DM gets the hump with me if we miss a day because I'm otherwise engaged.
I'm also expecting again and have been really struggling with sickness / tiredness on top of caring for a 6 month old. Not once has she asked how I am, on our numerous phone calls each week. I always initiate the conversation and ask how she is etc. She has no idea how much I've struggled with sickness because she simply doesn't really give a hoot about me, she is only interested in DD.
Anyway, this weekend since we've been allowed to meet up outdoors with other people we've seen my DP's DM and his step dad, for the first time since October 2020. Obviously his DM hasn't had the same contact with our DD due to her not being able to see us properly, so to be expected DD isn't too comfortable around her. I also met up with my friend who again I haven't seen properly since last year. I was made to feel so guilty for doing this!!! The passive aggressive comments were just ridiculous. Also this weekend it was our contact weekend with DP's DD (my step DD, not sure on correct abbreviation!) so we tend to be a bit busy these weekends and try to do fun things with the DD's.
My DM had my DD for a full day on Friday, as normal so it's not like she missed having her this week. Yet I'm being made to feel so guilty for seeing other family and my friend. This morning I sent a photo of DD to my DM of her wearing a tshirt that my DM got her for Easter and her reply was 'lovely, I might get to see it in person one day hey' 
This is just a few examples of how she makes me feel but I have a constant anxious feeling at the pit of my stomach because of the way she makes comments. I lie about things I'm doing to avoid her saying 'well why didn't you invite me' if I nip to the supermarket as an example.
Yesterday me, DP and DD went for a walk around the local area, had fish and chips and generally had a lovely day. Yet I can't feel I can share this info with my DM for fear that she is going to be mad that we didn't spend our day doing something with her or inviting her over.
It's all becoming very tedious and DP has commented numerous times on how anxious I am around DM. She cannot take a joke and always takes things I say the wrong way.
For context, growing up I had an awful relationship with her and she will always refer to me as being a horrible teen / child / young adult. The truth is, I was only the way I was because of the things she did and said.
How can I manage these situations so that they don't leave me feeling on edge?