As you say everyone has their limits. And lots of remarkably stupid things get done by drunk people every day - your friend's attempt to drive being a good example. So how can you possibly say "She probably knows that even drunk she wouldn't consent to sex "?

Not to be overly blunt but you have no idea what she thinks, what she is capable of and she herself may have no idea what she is capable of doing when drunk since according to the article she is a blackout drunk.