After the whole thing with 'Gaga copying Madonna' began Madge thought she can copy Gaga and run away with it because 'Gaga copied her first' or 'She is a queen and she can do whatever she wants'. That's why she sampled 'I like it rough' in 'some girls'. Even the title 'some girls' is not a coincidence. Theese are the first words of 'Dance in the dark'( after the spoken intro). The bassline of 'gang bang' was taken from the intro of Gaga's 'highway unicorn'. Also on MDNA tour Madge mixed the lyrics of 'Born This Way' with 'she's not me'. But was she allowed to do so? Of course not. Even if Gaga really plagiarised her it wouldn't give her any rights to do the same.