] Of coarse she understands, the evidence is what she told her husband after the ball, when she was angry from Darcy:

] "I wish you had been there, my dear, to have given him one of your set downs. I quite detest the man."

As I mentioned, we know she recognizes set-downs directed at other people. Whether she recognizes that Mr. Bennet is vexing her at the time he's vexing her is still open to question. I still think taking her frustration out on Kitty is an indication of genuinely being upset.

] I think she can ,remember the schemes she planned for Jane to spend the night at the Bingley's, though she was cunning, but it shows that she is clever enough to hold two ideas in her head.

What two ideas?

] Mrs Bennet is a special kind of people who use their brain only for the things they want to accomplish. They concentrate on some matters and neglect the others.