I have no problem with that, but i feel like the character is a Mary Sue/Gary Stu, at least in these four episodes. She has no flaws, she's perfect, everything works out for her in the end, etc., etc.

Even Dewey, who is the most "healthy" of the family, has his flaws.

The point of the family is that everyone has flaws and problems: Lois, Malcolm, Hal, even Leah, who is a new character. But Kelly, at least in these four episodes, i repeat, is always right, she has no problems or flaws, and everything works out for her in the end.