I think she could possibly just be that oblivious. You actually have to be semi-competent at something to actually be able to judge you are bad at it. (they did a study where gave people a math test and the people who scored the worst all believed they got a perfect score, the people who were at least able to do most of the test typically were much more accurate with guessing how they did although tended to guess a bit worse than they really did)

It may be she actually can't see it because somehow she just is so incompetent at whatever it is that makes most people not do that to others that she believes she is really a great person at it no matter how much evidence there is that she isn't.

I would like to hope she just decided to play this character and got out when it wasn't fun anymore, but I think she thinks she should be the winner of this season, and will probably be shocked she isn't fan favorite.