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It sounds more like your little girl has adrenal gland disease!  Ovarian
remment is possible, but not likely without a swollen vulva.  The hair
loss on the tail and itchy skin are common early signs (of this very
common ferret problem) of adrenal gland disease.  The exploratory surgery
is a good choice, but please have your vet check her adrenal glands!
Yes, adrenal gland disease can happen when they are this young, and
anemia is also common with adrenal gland disease.
 
Yes, bone marrow disease and cancer (lymphoma) are possible, but adrenal
gland disease is more likely.
 
Hope that helps,
Jerry Murray, DVM
[Posted in FML issue 4522]