It's like this ...
Berry is just another midunderstood woman ... er, female. A woman whose needs haven't been met in her life for one reason or another. And rather than wilt in a corner somewhere, she goes raging into the night, demanding what she needs and seeing nothing but her goal.
Berry keeps her eye on the tiger. To the exclusion of all else. I mean, all Cruella really wanted was a fur coat, right?
Other misunderstood women include Cruella DeVille, The Evil Queen, Ursula ... etc. ... any number of scary female villans from your last seen Disney movie.
And so ... in the spirit of being completely deluded and apart from reality (because the alternative is waaaaay too bleak), Berry will do everything and anything she can to remain deluded.
Anything else would be complete mediocrity ... and that is horrifying to her.
~D~
