I think at this point you really do need to bring in a professional dog behaviorist to help you work through these issues. Another thing is to take her to the vet for a full check up. There are medical conditions that can lead to sudden behavior changes/ aggression. Low thyroid is one of them.
Santina, owned by
Sky, Boxer, flashy fawn, docked and floppy, 7-24-09, CGC.
Happy, Puggle, 2-28-08, CGC.