I wouldn't be concerned; water weight will fluctuate for a while. I've had one of my big girls gain almost 100g while fasting simply from water. It's consistant weight loss over several months that is cause for concern. I'd say if she dips below 800, it would be a good idea to run a fecal sample to a vet to check for parasites.
I totally feel for you on the stubborn feeding thing... both of my girls are off food right now (sometimes it seems like they fast more often than they eat), and it is so frustrating!
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