naglady, bring her in, pet carrier, spare bathroom, keep her warm. If you have a vet, get a fecal check done. If not, worm her... everyone has their favorite go to wormer, you'll have to decide what to use. Feed extra protein, maybe some probiotics. Use poultry drench for a perk up. It is a nice quick influx of vitamins. Listen to her breathing, does it sound clear? Clicking? If she sounds a bit off, a few drops of VetRx on her chest, or a equal mix of that and water, use a qtip and swab around her nostrils. Well anyway, hope she'll perk up. She isn't necesarily old... maybe she just needs some doctoring...