I am not saying she should not have fought back. He raped her - he raped her a number of times - that does not seem to be disputed.. (though am sure if he were alive he'd dispute it!! 
)
However having read a number of reports now, HE did not force her at knifepoint - that was another man - the one who forced her to go to his apartment where she was raped. The man who pretended to be her boyfriend when he was in fact her pimp. He has not yet been charged and the sooner he is the better. With any luck he'll have to pay HER restitution and I doubt anyone will be setting up a go fund me for him! Frankly though, the men in her life were no better than each other.
I'm not surprised she cracked but she still wielded the knife while he was sleeping. As you say, she could have just tried to incapacitate him and escape.
Personally, I think its horrific that's she's been made to pay the restitution and I wish the courts could have had some discretion because I think they'd have used it.
I am not unsympathetic to her but I am trying (with great difficulty) to take a dispassionate view because that's the way the law has to look at it too.