Not huge but still pissing me off

so DH just called me SD has decided to change all Xmas plans to fit her needs. Plan was to have her xmas eve into christmas day till noon then go to BM till monday....Well she has decided she wants to go to BM christmas eve just to eat and then DH will need to pick her up when she decides she is done....My problem with this is we have xmas eve at our house. We have a huge open house with friends family and co-workers of DH....If he leaves to pick her up (30 min away) I will be left to be with co-workers. he tells me no problem. To you maybe and what really pisses me off is this happens all the time. We make plans but when SD feels she wants to do something else DH lets her....Then she is not going to BM all week again because of all those issues and has tried to call BM a number of times and she wont answer. But friday she told DH she was going to go. So I was a little excited to have him we were going to cook together and have some quality time because she has been up his ass all week.... She actually laughed at us because he had a conversation with me about pens. Well we cant talk about anything private she is right there in my face....anyway...She wants to go to SIL's for her birthday with my DH....Ahhh yah this party I have is about 50 people and I need help doing this, never mind the fact I do not talk to SIL so I will not go, years ago she said some nasty lies about me on facebook and to SD so i dont bother with her....So my DH says I willbe going Friday to that...REALLY!!!!! I dont think so if that is the case uninvite all your friends, which is alot, because I am not busting my ass while your at you douche of a sisters just bc your daughter wants to go.....F%^& that.... I mean seriously I am not the maid, and chef. BTW I am cooking everything including appetizers..... And SD told DH I want it to be just us..