I don't know Mary personally, and I don't know if she has a desire to be a competent martial artist or not. However if she didn't have that desire, would it really be anyone's concern but her own? How does her desires effect you, or not effect?
If she was lacking in some way martially well I'm sure she has a Sensei to correct her kata, mind-set or principle understanding.
We are all a bunch of yahoos on the internet to each other, and our judgment doesn't matter, and shouldn't matter. We are not each other's Sensei.
Well, this is precisely what leads to dilution of the art