I think that's actually *exactly* what she's talking about; the example of Doctor Who stories in which the Doctor is taken to task for his actions came up in the comments. I'm pretty sure she's just using different terminology than you are, but talking about basically the same thing.

I don't think it's unreasonable to talk about Mary Sues -- there are definitely characters that more than qualify for the name. But I think the term gets bandied about as a general insult, or a descriptor for OCs of almost any sort, quite a bit more than it should.