You really need to post better pics - squarer angles from lower down for eg. I hear you loud & clear about the lack of good info available about donkeys! So... I have a fair amount of experience with them (& great love for them) but no hard & fast facts on confo as compares to a horse, just what I've observed & upon speaking to other donkey people, seems to be normal. Of course, considering carefully how much 'normal' stuff is unhealthy & subject to their management, as with horses....
First up, she is very fat(even her tail looks fat!) & definitely needs to lose a fair few. Donks are built for really poor, arid type environments & as such are even more sensitive to the rich feeds & environments they're kept compared to horses, so therefore more at risk of IR, laminitis, cushings, etc.
The donkey differences that I think are *healthily* normal; Obviously their backs are built quite differently, far more flexible, no wither, etc. 'Cow hocked' is also a normal state of affairs for them. & they are usually a bit base narrow all round & have narrow shoulders & more angular croup.
'Broken forward' hoof/pastern angles also appear natural, as do (generally) slightly more upright hoof confo. A/p hoof balance in relation to the frog is also quite different, with a lot more toe in front of the frog apex than *should* be present in a horse. The heel corners end well forward of the rear of the frog and the quarters quarters tend to be straight or curve inwards a little. **However the basic principles of hoofcare are the same & walls/heels should be short, frogs full & wide, etc.
Hope that helps!
Sorry about the pictures-like I said, she was being squirrelly on the rope (A work in progress!) :) I did my best to get the important parts, like the hind legs and the shoulders, but all the better views came out blurry because she kept moving.
I agree with you about the weight. She's lost a bit since I got her, but it's hard to ration her feed without rationing my mare and the others she's being kept with. Some of it might also be her winter coat, which is almost 3 inches long right now.
I know about the high risk of founder, laminitis, etc. and the need to stay away from rich feed. I've heard that during the winter they should be fed 3/4 grass hay and 1/4 straw, but I don't really feel comfortable feeding anything that much straw, and my horse(s) and other livestock can't have it, so I've just been feeding a straight low-nutrition grass hay, not the richer kind like timothy grass or orchard grass. My mare is also an easy keeper, but I've had to supplement her with a little grain and alfalfa pellets to make up for the gaps in the grass hay diet.
Anyway, I figure she could use the little extra "fluff" in the super cold parts of winter when it hits -20 F or lower out here. Once it gets past that point, I plan to put a little more effort into dropping weight off her, but for now she needs it. They all have access to a shelter, which acts as a windbreak and rain/snow cover, but it doesn't help the sheer temperature. Not to mention they'd all rather just turn their tails to the wind anyway (Silly horses :P).