Ugh, seriously neglected feet! I'm guessing this guy hasn't had a farrier out to her for well over 6 months actually.
Donkey's feet tend to be a little steeper, heel platforms more forward of the bulbs and feet more oval than a horse's. While *as a rule* it's best not to remove much if any sole material from a horse on a regular basis, donks tend to build up & retain a lot more than horses & so it may need to be pared each trim, to keep it from becoming a problem. Donkey's feet, aside from these above differences, are built the same way as a horse & the same principles apply to trimming, balancing and mapping. *bearing in mind bit more oval shape. Mules can have very donkeyish feet or very horsey feet, or half way between.
So... Firstly, it is the convex dorsal walls, the slight 'broken back' hoof pastern angles and the steep angle to the hairline that makes me suspect 'negative angles' to P3. Couldn't be absolutely sure just from these pics, and rads would be best... but guessing that's not going to happen.
It looks like poor Molly has at least 1" of excess horn right the way around - except the broken bit of course - that could easily come off immediately. Then, as explained, I would expect there is a lot of excess rubbish sole, that if cleaned out, you might find there's another 1/2" or more wall to remove. Bars also massively overgrown & need cutting right down.
As feet need to be cleaned out properly - excess sole pared back, to find true sole plane, true edges of sole; bars taken back to find heel corners and the ends of the bar where they merge with the sole; Ratty bits of frog, and the tip pared back to find the true frog apex - in order to 'map' them accurately, my lines I drew are extremely rough, just where I guess the foot is.
That broken chunk/separation appears to be full of seedy toe, which is something I've found is often a lot worse in donkeys - maybe their feet are more compromised in 'normal' environments because they're evolved for even drier environs than horses.
Donks, IME are far more stoic than horses - or at least, people are even less tuned to donkey bodylanguage, so they're even less aware of how they're feeling. So if the mule is obviously uncomfortable, fair chance that she's suffering substantially. Could be something else of course, but chances are, she's pretty uncomfortable, on those feets, and maybe arthritis or other joint probs from the 'negative' angles.