1. How is she after the car accident?
2. What's her new husband like?
3. Those are her cars, which one do you want to borrow?
4 "Which sister do you like best?"
"What a question! I refuse to answer." or
"What kind of question is that? I refuse to answer."
5. Whose car is that?
6. "Which of her cars do you like best?"
"I like them all. Which one do you like best?"