As horrible yesterday morning was somehow all I wanted to do was just ignore SD15 and DH and have a peaceful afternoon/evening with BS5.
When SD came to live with us we said all fine but when it is afternoon/ or just before BS's sleep time she shall wait to take a shower till he goes to bed or she shall use the downstair's shower. It was all agreed. After the hell day in the morning she comes at 7pm as the BS5 is eating a sandwich sitting with me and says that she is going to take a shower and if he needs to go to the bathroom he should go downstairs. Of course I say that either she shall wait as he'll soon go to the toilet and brush his teeth or she can use the other shower.
She is like "why should I inconvenience myself, I don't want to go downstairs" so I say then she needs to wait. the answer is is again "why bla bla bla". I say actually there are more than one person upstairs might need to bathroom. So she is like "do want to use the bathroom,go to the bathroom etc" Due to al happened in the morning Step-monster is already awake and on the hunt for a kill, I say that I will but it might take long time as I seem to have some problems with my bowels, and close the bathroom door. just as I am thinking "Oh God I should have taken my cellphone with me as it will be boring sitting down here doing nothing" she starts loudly talking BS5( who is her half brother) that his mum is so rude, and single most terrible person in the world, that she can't stand me. So i get out and push her away from the sight of BS. I tell her that she has crossed the line by telling him such thing. She tells me that he should know because I am a horrible being. I say it is enough and get out. She starts shouting so I tell her to talk to her dad.

Don't know exactly what had been said. I know she was shouting at him (which he said earlier in the morning that she never did before as he never gave her a reason - Such a Bulls.it as he is a disney dad), she came upstairs, and said "sorry". I made the correction of "sorry I made bad comments to BS about you, it was wrong" so she repeated and added that 'because you made me angry". I felt like slapping her if not killing. really she is spiteful.
this is no way bragging but if I didn't agree and help she would have been in a foster home in UK, given that she is 15 it wasn't easy to find a home. Her grandparents or any relatives of her want to take her on. but I did and this is what I am being punished for.

If anyone wonders, when I met her father he wasnt even seeing her. He had been broken up with her BM 5 years prior and had other girlfriends after that. It is not like I took her place or anything like that to cause somehow hatred (not that I thing any of us ever deserve). When we got married I made the effort that he saw his daughter, coz I wanted the man I married to be a good father, so that if one day we have a child I would not ask him of something different.

Yet now I turned into this psycho who is just wishing her away