Please give me some insight on toxic mom šŸ˜©

My moms in town staying with us because Iā€™m about to have my first baby, sheā€™ll be here for a month and is the only family Iā€™ve literally ever had itā€™s always been just us two. most of the time she is pretty helpful. She helps cook and clean, will help pay for things. But thereā€™s this other side to her too that I hated growing up with and donā€™t want my daughter to be subjected too after sheā€™s born.

My mom has a ā€œpoor meā€ attitude, and she drinks lots of wine every day which leads to her to emotionally implode on me. And she doesnā€™t bring up normal things, last night for example she tried to pick a fight with my fiancĆ© after drinking because he said ā€œit donā€™tā€ instead of ā€œit doesnā€™tā€ and that wasnā€™t proper grammar. Like who tf cares? I shut it down which turned her attention to me and she wouldnā€™t stop arguing, I kept telling her she was acting crazy and that this behavior isnā€™t normal or healthy. My fiancĆ© said itā€™s not that serious and we should just let it go and she told him to shut up! I went off at this point and she started jumping from weird reason to reason as to why sheā€™s acting this way but refused to acknowledge itā€™s the alcohol.

She went from ā€œyou donā€™t know what Iā€™ve been throughā€, ā€œIā€™m acting this way because Iā€™m going to die soon and proper grammar is my gift Iā€™d like to leave my granddaughterā€, ā€œmy whole life I just wanted someone to love meā€, etc, none of this shit made any sense!

She threatened to leave early after I told her that Iā€™m drawing a boundary now that she cannot drink like this anymore around me or at all in front of my baby because this is INSANE and Iā€™m sick of it! My whole life sheā€™s done this, and itā€™s so weird and toxic to me.

After I told her no more she accused me of trying to change her and that she wouldnā€™t stop for me or anyone else, that Iā€™m condescending and if I really think sheā€™s ā€œa danger to my baby then by all means protect herā€

Today has been strained and awkward and I just donā€™t know what to do, Iā€™ve never stood up to her like this and threatened to cut her off before and I want to focus on having my baby without this outside stress but she does this every damn time I see her. Good for a few days but then goes off the rails and Iā€™m at a loss, she didnā€™t really sound like she is gonna respect my boundaries and she brought a new box of wine to my house today but I havenā€™t seen her drink any of it yet? Please anyone help me navigate thisā€¦