Why is your cockatiel not able to walk on her foot?

There could be several reasons your cockatiel is unable to walk on her foot, including injury, infection, or a neurological issue. It's also possible that she may have a broken bone, sprain, or Arthritis, which can cause pain and limit mobility. Observing for any swelling, changes in behavior, or reluctance to use the foot can provide additional clues. Consulting an avian veterinarian is recommended for a proper diagnosis and treatment.