It is far more complicated than to say that. I actually agree that, in general, she "knows how to coach". But did she have problems because she wasn't able to recruit players that responded to her coaching style? Or did she misjudge what the players were capable of doing? I have no idea, but it is a little more complicated than knowing how to coach.
I think part of it is having the right staff around you - I've never thought Brenda Friese was a game planning genius, but she has had assistants that are really good at that sort of thing. As always, part of it is having the right players, both bringing what you need to the table, but also being responsive to your coaching. I always thought that part of former RU Assistant Carlene Mitchell's issues at UCSB - and I saw them play against UofA her last year there (and had a chance to speak with her) - was that the players were not up to the expectations (in terms of executing a game plan) that she had of them.