Need some advice on my mother

This might be a little long, sorry but desperate for your thoughts. I am 28. My dad passed away in 2001 so he's not around and it's just my mum, older brother (married with kids) and older sister (long term relationship).

My mum has constantly been over bearing. Since my husband and I got together she has dictated how we live. When I was "allowed" to move in with him, how he spent his money (we bought a dog with some cash he had saved up), negativity about almost anything (when I said I was taking a photo of my dad with me as a baby to hospital so he was there during labour she said he'd be of no use), turning up at our door with random stuff like a bottle of shower cleaner because our shower was only cleaned once a week. She's constantly inviting me with friends and family to her house about twice a week and the pressure is on. When I say I can't due to other commitments she throws a teenage wobbly. She told me last week however she has booked a holiday with her ex bf (they broke up last month and were together for 4 months) and they're going on 19th October, I'm due on 7th October. I am beyond upset. She is illogical, belligerent and selfish. I'm at the point where I want to cut her out my life but she is all I have as a parent now. My husbands parents are amazing so I know I have them. There have been 100's of other upsetting things but way too much to write. I just don't know how to deal with this situation. She doesn't listen. My worry is her just turning up when we have the baby and telling me everything I'm doing wrong and upset me more.....