If you adopted a dog and all members of the household weren't in agreement, that was your first mistake. The second is thinking that you can have a bond this early, especially in light of what has gone on.
I'm not trying to be harsh with you, but really, what did you expect would happen? Look at this for a moment from the hound's perspective. Everything she has ever known about life, routine, and survival has gone out the window. Nothing in a racing greyhound's past prepares it for life in a home or the bizarre expectations placed on a dog living in a home. You're expecting this hound to fit into your life and not be a bother. At the same time, you're not expecting much of yourself or the other household members. IF you want the hound to trust, bond, and learn the ropes of a household, you have to have patience, give her guidance, and show her the ropes. If you can't figure out why she screams, doesn't trust you, etc., ask yourself why you're chasing a fearful hound who already doesn't trust...and why you think that would make her more likely to trust you...it doesn't make sense.
Hounds are like children. They need nurturing. They need patience. They need to be baby stepped through the new things in life. They need to have parameters set and to respected. I'll bet your daughter didn't come fully trained, understanding all of your expectations of her and potty trained to boot. Why would things be different for a dog? You give them the tools to succeed and they will.
Right now you're expecting more of the hound than of the people. Until that changes, none of you will be happy.
I totally agree w/this. Greyhounds are not for everyone, they are sweet gentle souls and do not respond to being grabbed by the collar and will retreat when they feel threatened. If you feel that it is not working out, maybe the best decision is to call the adoption group and return this grey.