The over-flexation of the pastern on the near hind, that AB is referring to, is apparent in every single stride she is taking at the trot in your second video (I was never able to get the first video to work for me, so I can't say either way for that one)
ETA: Suggestion. Send the link to that 2nd video, to your vet[s]
I can do that. I can send it to the 2nd vet as I have their email. He seemed like a REALLY good vet. Also...could she just have longer pasterns? My mom's horse does and it looks like that.