Long story short - I come from a pretty dysfunctional family as in co-dependent bordering on narcissistic. I am mid 20s, getting married next year and have a baby on the way. My mum didn't take to my partner too kindly after we started to get serious (accused him of ruining her life because him and I moved together) and has had to apologise to him for things but there continues to be a very awkward relationship and I feel like we are always dancing on a volcano i.e. if you give them an inch they'll take a mile. I've been to a lot of therapy over it and trying my best to put in boundaries.
My DP and I bought a house together about 30 mins away from my parents last year and with jobs, life, work and now baby on the way I don't go down to my parent's house as much as they would like.
I had invited my mum to my house today for lunch and she said yes and then text earlier to say that she had a sore head and wouldn't be up so that was fine. I work from home anyway and took my lunch hour as normal. She knew I was going to be really busy today outside of my lunch hour as I text her this. My partner had to come home early because of the weather (admittedly took a break to spend some time with him in the bedroom) and whilst we're finishing lets say i hear a 'hello!!' from downstairs - my mum walked in through the back door.
I came down awkwardly and was like eh why did you not tell me you were coming you know I'm working to which she said she didn't have to tell me if i wasn't here she would've just driven on but she made a decision to drive 30 mins to my house out the way without telling me when she knew I was busy. My partner is annoyed too because he's like there's literally no boundaries and she just thinks because its her daughter's house she can pop by any time she wants.
I'm so angry at her just coming in and flicking the kettle on as if this is just her home and then just talking to me as if everything is ok and fine to do.
AIBU to be this upset at this? like I'm on the verge of tears with anger.