The original problem, from her website:

"Suppose you’re on a game show, and you’re given the choice of three doors. Behind one door is a car, behind the others, goats. You pick a door, say #1, and the host, who knows what’s behind the doors, opens another door, say #3, which has a goat. He says to you, "Do you want to pick door #2?" Is it to your advantage to switch your choice of doors?

Craig F. Whitaker

Columbia, Maryland"

(a) she didn't originally pose the problem, it was a question asked of her, and (b) the wording of the problem is not ambiguous.