Re: No Eowyn, Galadriel?
Eowyn was never in a "commander" capacity though she was hiding as a normal rider. Also she was not even born at game start or at least very young.
Galadriel, well maybe, she did go to Dol Guldur and smash its walls somehow so maybe she should go in. However the hard coded limits in the game prevents us from doing her justice.
Maybe a mod could make her into a unit with her "handmaidens" as a female archer unit or something with a generals ability to instantly take down a section of a wall. No idea if that is possible though, I doubt it.