It sounds far more like fear than dominance to me. Do you know her history before the rescue centre? We have two ex research beagles and they were very nervous when we first got them. All they wanted to do was sleep and be left alone. You havent had sweetie long, so let her have more time to adjust. Shut all the doors in the house except where you are sitting. Dont force her to come to you for cuddles, try to ignore her, but if she does come to you then gently stroke her and put your arm round her. She loves walks, that is great, make her sit whilst you put her harness on and tell her ' walkies'. When you return home, let her stay in the garden if she wishes. Let her sleep half the day if she wishes, ours did, eventually she will feel safe in your house and want to be with you. once over that stage you can start training her, but dont rush things.