As with everyone, there's a long history, which it would take 5-6 forums to detail between mother and I...
In short we can say that she's incredibly reliant on me in every way and has been since I was fairly young - moved into my bedroom when I was 9 in order to cry on my shoulder each night despite dad being in the next door room e.t.c. I no longer expect anything of her but am in close enough contact to be of help (emotional, financial) to her and try my best to keep my sibling in close contact with her too.
However... she has let herself get to a state - financially, health-wise and emotionally where she is really pathetic and now, with news of 1st grandchildren in the family - both sibling and I have conceived this year. She wants to come over and have something to do. However, my experience of her visits are very negative - a ton of work for me emotionally, physically, financially.
We chatted about my feelings. she understands but claims she will 'change' between the now and the time I am due - late March. She's made this 'promise' maybe... 1000 times before and has never kept it.
AIBU to not want her anywhere near me when I am going through this stressful time - husband has very involved job, lots of travelling, we have just moved to new area don't know anyone, I will be fairly alone and need to feel like I am just looking after my child not my mother too.
I know things 'change' with parents when you have children but I am going on her 100% failure record and a fear of making life more stressful than it needs to be.