My Abby girl had started growling last spring and I also asked for help. Someone (maybe it was Aly) suggested I just ignore her at the time - so thats what I did and she stopped soon after.

Abby started out by growling at Buddy and he totally ignored her, and then she started growling at me when she didn't get what she wanted! So I stopped telling her "NO" and just ignored her. Hope this helps.