In "1984", in room 101, Winston was forced to betray Julia by asking them to "give" the rats to her. She also says that
"sometimes...they threaten you with something – something you can't stand up to, can't even think about. And then you say, 'Don't do it to me, do it to somebody else, do it to so-and-so.' ... And after that, you don't feel the same towards the other person any longer".

It means, that they wanted to do something to her, but she asked them to do it to Winston/somebody else, but nothing happened to Winston. 

What did they try to do to her? What was the way they tried to break her? I know, that she had a lobotomy, but that is not an answer to this question. Anyone? Maybe Orwell skipped the fact on purpose?