I'm going to be a mean person for a moment. I've been mad about this all day. We had her for four days. The vet felt a mass in her intestine, and says it probably has been there for quite a while. They couldn't get a temperature reading. There is no excuse for her previous owner to give her such bad care. Feeding her a bad diet, keeping her in a cage with newspaper for bedding (not sure how bad that is really, but in my book I find it inadequate to use on a guinea pig), I later discovered her cage has a big piece of wood screwed to the bottom to cover a big hole, letting her nails become overgrown, and just lose weight over time. Not even basic needs were hardly met, if at all. I'm sorry, it's mean, I'm venting. I'm sure it's because the previous owner had no income (which I can't figure out why they got a dependent to begin with). I told my children that she needed to stay in the hospital for care. They don't know that she had to be "helped". What is wrong with people!?!
There are just some people in the world like that, and it's people like us that these types of animals rely on, I rescued three bantams here a while back, they were all kept in a severely cramped cage with several other birds. All three were under weight, my rooster had been so badly pecked, his entire chest and belly was bald and severely sunburned, both him and my older hen had no tails, they had been plucked, and the younger hen had been severely pecked around her back and tail. The rooster now has a full chest of feathers, both him and the older hen have several inches of tail now, and the younger hen has completely recovered.