I think you and I are on the same page about Lisa's character.
As far as the donation to Clay ... I don't doubt that her efforts were partially self-serving if only so people wouldn't dislike her so much, and to show she does have a heart ... since she was mostly heartless throughout the competition.
Dayana said that Lisa doesn't have respect for herself ... and I agree. She seems to be a very insecure woman and covers it with that brashness and dirty mouth. Think about it. I suspect that Dayana is what Lisa has competed with her entire life and has been overlooked when a Dayana is in the mix.
So Lisa is out to prove that she is just as good and worthy. She just doesn't know how to do it so she hides behind that tough broad persona. I wish she would find another way.