The main character never evolved so it died.
The main character's stick up her butt killed this show. They never evolved the character. They were more interested in showing her shoes than any growth of character. The co-stars carried the show. They added a lightness to it all. She stomped around with her purse hanging off her hand, head straight... never looking left or right. It didn't work.
Look at "The Closer"... she evolved quickly and became likable.
Look at "Bones"... all of the characters have grown and changed.
The character was unlikable and it could not garner the support of other age groups.... you know I am right.