Have a 5-6 month old araconna hen from a rescue. She has been with me for almost 3 months and very friendly and seemed healthy. She still eats and drinks and eyes are clear. But, last week she started stumbling and falling over. I isolated her for the last 5 days and she is worse. She just falls over when trying to use her left leg. She sticks the left leg out in front of her to balance while sitting and eating in a carrier. Any possible suggestions???