Very expected with a wound like that
Bad news: looks like the extensor tendon is severed. The ends have retracted too much to sew them together at this point. I am to continue what I’ve been doing and we’ll check again in 2 weeks.
We couldn’t even find the end of the upper portion of the tendon on mine
The best option is for her to be hospitalized with fancy therapy and a cast. That option is also so far out of my budget as to be laughable. Thus the current recommendations. In a few weeks the skin around the wound should be as retracted as it’s going to get, so more aggressive debridement should happen as well as figuring out what to do about the tendon.
Honestly? After going through mine, and talking to probably a dozen other people with the same situation, I think too many vets over-complicate this particular injury. NO horse I know who severed this tendon has been in a cast, and ALL returned to soundness and their previous level of athletic work. Keep that leg snugly wrapped down over the top of the foot, keep fetlock flexion limited, and in a couple weeks, allow light controlled movement, starting with something as big as 2 stalls and working from there. That’s what I did and what I’d do again if I had to 
Oddly she is walking normally even without the bandage. I guess she shouldn’t be able to extend the fetlock joint at all? The vet is hesitant to declare it totally severed.
It’s not that hard to know if it’s totally severed or not. But don’t forget there is a smaller, lateral ET which can take on some of the work of the long ET. So that can help flip the foot up during quiet walking but it’s not strong or effective enough to keep it flipping up for anything more energetic, hence the risk of catching the toe and hyper-flexing the fetlock.
. He was pretty impressed that she is bearing full weight on it, so that is positive.
It’s not a weight-bearing tendon, so once the pain of the acuteness of the injury is over, full weight bearing is pretty normal