Why? Who the hell would know? Couldn't you ask that about ANY actress? You don't even know that she'd be interested OR was considered. But, yes, she's too old at 45(ish). And, I think she's too "strong" a type, too mature (regardless of her actual age).
Paulus would likely have a great take on this, but the ART in Boston did a production only a few years ago (with Amanda Palmer), so they wouldn't be ready for another production.
If we're not having fun, then why are we doing it?
These are DISCUSSION boards, not mutual admiration boards. Discussion only occurs when we are willing to hear what others are thinking, regardless of whether it is alignment to our own thoughts.