i'd let her rape me in an instant.
I guess she was having an inner battle as well as one with preventing Wolverine from coming towards her, so because she was all "OMggggg jean or Pheonix? omgomg i dunno" and "omg wolverine lol u regenerate shit" she went back to jean and Wolvie killed her.
...
I dunno, I'm just talking out of my ass.