I think Donna Murphy is best when she's a little out of her comfort zone. Anna in the King & I, Phyllis in Follies. They're roles that, on paper, she shouldn't be right for or capable of doing. That's when she rises to the occasion and surprises people. It's challenging for her as an actress and performer to convince an audience she can be someone so "away" from herself.
But the Witch seems like something she's either already done before or could do in her sleep. Not much room for the unexpected.
I have no doubt she'll be good and reliable and solid, however.
"Jaws is the Citizen Kane of movies."
blocked: logan2, Diamonds3, Hamilton22