i agree with sarah on this one. you may also want to check her for lice. my friends doe has been getting skinny for months now, she has been wormed and treated for cocci, her fecals came back clean but her gums were still pale. I really did some hunting and found some lice on her. mites can also take a lot out of a doe and make her get thin.
Goats get a lot of protein just fraom hay and browse. If she is on a good quality pasture she doesnt need a lot of extra protein in her diet. Carbs also help to build weight, just like they do in people. carbs give a goat inergy, inergy she needs to put into making milk for her kids. If the kids are old enough to be weaned, weaning them will also help to get weight built back up. as the kids get older they really start to take a toll on a doe. six to eight months is past peak production for a doe, and if the kids are still nursing her body is telling her she needs to slow down on the milking to build up strengeth for the coming breeding season. The kids are demanding more milk and kieeping her nursed out is telling her to make more milk. if she is towards the end of her lactation she is putting a lot more energy into making milk then she needs to.
beth