It looks like you lost her trust when you left for an extended period of time and you will have to reestablish that trust by more or less starting from scratch, treat her as if you just got her and start earning her trust, realize it may take some time for things move slow in grey time. Don't take it personally when she wants to bite you as she is just reacting to the possibility that you may leave her again but time and patience will bring her around. Don't force her to do what she doesn't want to do for now, just interact with her and let her know you care and will be there for her but she will come to you when she feels she can trust you again. You can help by offering her treats and being there talking to her, soon she will want to be with you and she will come seeking you out but let it be her decision, you have to earn that trust and sometimes it can be a long and difficult process but well worth it when it happens. Good luck to you and keep us posted as to how it progresses with her. She is a lovely grey.