Hoof Update and Weak Stifles?

I trimmed Ava's feet yesterday with my new hoof nippers. It made my job so much easier even with Ava being a pain in the butt. I think they have definitely improved especially on the heels. Her feet were really dry so I couldn't get all the bars off but hopefully all this rain will soften them up. I don't know if you remember but I posted the very first pictures of her feet before I started doing anything to them and her heels very slung under, it did not make me happy. But it looks like her heels are coming back and her balance it getting better.

Also I am having the vet come out on Thursday to check out Ava's stifles. I won't go too much into details until after I get a diagnosis but so far it is looking like she has weak stifles or a possible locking stifle. I put some pictures below of her cantering. On her left she seems much more calm but on her right it seems tight and rigid (especially when I ride..) She has also been falling on her hind end more often than before. I uploaded some of these pictures to a horse forum and the responses said that the stifles do look weak, so, I'll see what the vet says.