Another fecal would be a good idea. Its possible to get parasites from prey, to harbor them without symptoms and for a single test to miss some of the more difficult to notice bugs. Its an inexpensive test and an easy remedy if there's something in there. That's a lot of weight to lose in 3 months, a fecal or two would be my first course of action. I'd also palpate her for growths/tumors.
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Julie
www.[url ban]/gfx