I don't think the lack of training is a problem, though it's often described as the only thing she needs to get up to the higher level.
From what I've read it seems like the idea is that people have trained her, but come to the conclusion that while she was not completely inept by any means, she isn't cut out for it so they stop training her. So based on all the things I've read it's not that she's doing really well with little training. Not that she's horrible at all parts of it. I have just always thought it was made clear that the others thought she had problems training wouldn't fix. And at this point she should be pretty experienced.