I've never given it so looked it up on BYC. A chicken can safely have up to 120 mg of aspirin a day. A baby aspirin is 81 mg. If you wanted you could cut the baby aspirin in half and give 40 mg twice a day, but you'll lose a little in the cutting. I would only do this for a couple of days and that should get her over the edge hopefully.One whole baby aspirin? Isn’t that a lot for a chicken?