Op. My mum was like this. She has always been very religious and also a massive martyr complex as my Dad was a dick as well. When i told my my mum i was unhappy etc she said " well thats the choice you made". Basically i did divorce and had no help or support from her at all. In fact when i told her , all she said was " well you can't move in here" and " what will people say". I didn't need to move in with her as i had already bought my new home and mid way through renovation- she was shocked and annoyed! I did not need her. I removed her ability to belittle me and refuse me and my children housing, i had it already sorted. I then said i couldn't give a monkeys what people think- this is my life! I basically dealt with it alone.
She deliberately gave me no childcare help etc ever at all , as i worked full time- basically let me struggle alone during sch holidays and when i was ill, to make a point , as did my sister. Good old after sch summer club was my saviour. But according to them, even that was bad for my children's mental health!! I should have been at home , living in abject poverty with my children as a divorced single woman, rather than working and providing a quality lifestyle. She even picked holes and chastised me one time for the fact that i drank Tesco Finest Earl Grey Tea bags! Being divorced , my children and i should have been surviving on gruel no doubt! Long story short i have been NC with my mum for yrs, i am fine , my DC's are fine, young successful people. No drama, all good. Make my own choices, am happy.
You sound a lovely strong and determined person Op and your children need you. There is so much good and all exciting , ahead for you now. You do what is right for you. You are making the right choices for you and yr family. If your Mum cannot find it within herself to provide the support you, as her daughter, needs, you are better off staying NC. This is her issue and not yours.
You will come through this OP but, if you are feeling overwhelmed , pls do have a chat with your doctor. We all deal with these things differently.
When you are settled in your new life you can decide then, if you want to reinstate any contact. Right now OP, you need all of you for you and yr Dc's. You need to be surrounded by people who will support and encourage you. My parents did what they did, put up with what they did , behave how they do/did, for reasons known only to themselves and their own agenda. I am me and i do what is right for me - they ( mum and sister) do not dictate to me anymore. Your mum does not get to dictate to you anymore.
You asked why? I often asked myself why my mum was how she was. I see now she is quite a bitter person " lumbered " in her own words with my sister and i. In love with someone ( my Dad) who cheated on her often and beat her child ( me ) daily for no reason at all , other than as an outlet for his own miserable marital frustrations. Mum saw / see's me , the eldest , as the reason my Dad was always " busy" and. "angry" and the "root cause " of all her problems. If i had not been born it would have all been different.
Not sure what your mums beef really is , she clearly has one , i am sure that it is HER issue and NOT yours. I "let go" of my mum and sister yrs ago. Last time i heard they are in the same ruts. I however, am fine and happy and my children are happy and have been raised with healthy boundaries. A mum who supports them unconditionally and healthy family and other relationship examples.
You do not need a mum in order to be a mum , as i have found. All the best to you OP.