We have had Ony for about 8 months now. Everytime I go to handle her she opens her mouth like she is goin to bite and her beard turns black. This has been goin on for about 3 months now. Before that she would just run away from my hand. Usually I can coax her into calming down and letting me pick her up. However, she tries to run away after I take her out of her cage. Today she was tryin to run and when I caught her to keep her from falling down, she bit me hard. What are some reasons she has yet to warm up to me?