My Runner drake is the same he always lets his ladies eat first. What is so cute is in the evening he will go in with some of his ladies then if some are still out he will go get the rest.
My 2 young Runner drakes could care less.

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I'm thinking a boot, like you said, to help support and immobilize her ankle. It probably felt better after the bath, but when she's been on it for a while it may just 'give out'.
Let's see what the doctor's verdict will be. I'm nervous...Taking her to the vet for an examination and maybe an xray if at all possible would be the way to go then you will know for sure what is going on and hopefully correct it. I would think eventually she will lose all use if she keeps pon the way she is. Just my 2 cents.
That is why in my humble opinion it is necessary to have a drake in the flock. Drakes are the watch-towers securing the area while the ducks are foraging and distracted. If there is no drake, one of the females will slip into the drake role, which i don't think is good for her health.Our fancy drake is always the last to eat, he lets the ladies have a go at the bowl first and then wraps it up. Is this general behavior or is he just such a gentleman? I would guess general, part of taking care of the flock?
Nope, they don't carry those. All i have ever found are those below on Amazing. The soft ones would not withstand Blanca's wreath for seconds and the hard ones look really uncomfortable - and also will be destroyed by her…You can by braces look at my pet chicken I believe they carry them.
You need to put an Elizabethan collar (cone of shame) on her! But you may not have enough limbs left afterwards...Let's see what the doctor's verdict will be. I'm nervous...
I have not been able to imagine how to build something like an ankle brace for a grown up duck that she wouldn't be able to pull off and/or shred to pieces in those three weeks.
I tried to cast one of these, but made a mistake when mixing the concrete, so it stayed soft…You need to put an Elizabethan collar (cone of shame) on her! But you may not have enough limbs left afterwards...