my female zebra finch

Question
my female zebra finch has puffed her feathers out and keeps loosing her balance. This happened all of a sudden can you tell me what is wrong with her?

Answer
Pulling out feathers is a sign of stress. Do you have a heat lamp on the cage? If no, get one. They are in the reptile section of pet stores. Make sure it isn't the male pulling out her feathers.
If this doesn't help, move her to a seperate cage from him (with a heat lamp on both) and put her a quiet area. You have no idea how much good this does for birds.