Spence,
I really feel she has hit the terrible twos. One of my greys is the same age and we are going through different issues but I do believe they change at this stage.
Try and ride through it as I know you love her to bits and I really think you would regret rehoming her in the long run.
I know its hard work and can be quite heartbreaking seeing your baby change, support is here for you and help if anyone can give you any new advice.
I hope you can work things out, good luck and keep us posted:)