Honestly, my personal opinion is that it looks fine. If you say there are feathers coming in there, then I'd say, pretty decent. All the feathers are growing in the same direction, and I think the shredding looks great. The axial feather, BTW, is a short feather, and on the last picture (the left wing), I think you've pulled the wing too far out which shows that gap. I think the wing is beautiful. The left wing-- first picture-- I'm not so sure about the gap, I wonder if she has feathers coming in? Could the gap be there because you pulled the wing too far out? Okay-- so back to the right wing, is that a bit of twisting in the secondaries? Or is that the light hitting it so it kind of looks like that. If they aren't twisted, I'm still not so sure I'd call it a split... I mean, I'm not crazy, I do see there is a gap there, but did you say you did feel feathers coming in? Maybe wait a couple more months and see? The other thing that makes me think it isn't really split wing is because of all the wing pictures I've seen, most of the splits occur closer into the primaries. I think your axial feather might actually be there... ? and she is likely fine. But that's just my opinion.
***Hattrick posted this picture on their site as a Split Wing-- showing how the feathers are growing in two different directions..
See--- I think this is just a very confusing subject. I have some really immature wings right now. I should post some more! They look like they have obvious splits in them (they are immature wings, too) but the direction remains the same (growth wise). This bird looks better than a couple of mine that I'm worried about.
But yeah, she tucks them up nicely, looks great that way. Some of the obvious splits looks like their feathers are sticking out or stacking wrong.