A biting question

We adopted a Green Cheek from a loving family, who decided it was in her best interest to let a family take her who had more time to spend with her. She is amazing and came to us slightly timid but seemed to warm up to me almost immediately. She talks, whistles, and makes the most beautiful song when she is happy.

We were informed she didn't spend a lot of time out of her cage with them. We are the opposite, and she spends majority of her time out of the cage. She would either be perched next to me while I study at my desk, or on my shoulder preening me. We talk to her, kiss her, socialize with her, but again she mostly stayed near me. We also have a Sun Conure who is quite a character and is partial to my husband.

We have had her a several months now, and then all of a sudden her personality changed. She wants nothing to do with me. I try to get her out and she bites me, and not just a little nip but she will grab on and grind her beak on me until she draws blood. Last night I was laying in bed and my husband got her out. She loved on him, was singing and talking to him, then literally flew to me, hovered and then grabbed my hand and wouldn't let go. I yelled out because it really hurt, but she didn't attempt to stop. My husband had to get her.

It breaks my heart and I feel like I did something wrong, but I know I have not changed my behavior towards her. I have been trying to take her her favorite sunflower seeds and talk to her in a gentle loving voice and come to her slowly attempting to reassure her. I'm absolutely lost! I know that our Sun Conure is a spolied brat (I say that in a loving way) and the Sun nip and bites, burps at you and really has an attitude that is unique to her-Is it possible that the Green Cheek sees that behavior and is trying to imitate it or did I do something wrong? The two of them get along well. They sit together on the bedroom door and watch the world. We LOVE our birds and wouldn't trade them for the world, I just need help!