So should I start again???? I'm guessing the answer is yes....
I would, if it's not too much trouble...or put in some more shovels of good, fresh earth and give it some time. Did the ashes take care of your mite problem? If not, I'd put some NS on the mite eggs near the vent, if any, and do it all again. Dust that dust wand of a chicken!
Should I be worried??? Is there anything else I should be doing for her??? and should I keep her isolated???
I've no experience with crop problems and never really had those in my flock, so I am no help at all....I'm sorry. Anyone else care to weigh in on natural ways to prevent or treat this malady?
Of course, it's probably because I cull all the overeaters like Wyandottes, Buff Orps, etc. that I do not have these issues. Culling really seems to circumvent a lot of problems that are breed or genetic in origin. Even if you live in the city and just have a small flock, you will find that eventually you will really need to cull for certain traits if you want to have a healthy, functioning flock. I know that probably takes most from 3 chickens down to 2 but that is why I don't normally advocate for chickens in the city....3-5 chickens does not a flock make. You really can't manage it at all the way it should be managed and then have to resort to treating them like pets...which I understand that many city dwellers already regard their chickens in this light.
The only problem with this is that unless you have bought your birds from an exceptional breeder who has already done all the foot work for you, you are going to have pets that are prone to a wide array of maladies. Does anyone really want a pet that ups and dies for no reason that you can see? Or that develops any number of illnesses and diseases of which you have no idea how to prevent? I think that eventually this whole pet chicken in the city craze will fade away and once again the country folk will be raising the chickens again...but until then it is going to be stressful and very difficult to marry the two factions, simply because the chicken is a livestock/farm animal and does not make an ideal pet at all.
Most folks who choose chickens for pets choose the pretty chickens with colorful feathers, interesting top knots, feathered feet or with no feathers at all because that's just what pet keepers do...they all want a cute pet. But, in all honesty, the most healthy breeds I've ever had were the ones that were just plain ol' utility breeds...White Rocks, Black Aussies, RIRs, White Leghorns, etc. Nothing fancy, nothing to impress folks with except good health, exceptional lay, and a stress free life.
If that were my chicken I'd probably cull her, particularly if this is recurring and causing her respiratory distress. Sorry....