Ah! The teen age time, I had it really bad with Paladin. Seemed like everything he was taught just went out the window. But at about 13 months he seemed to regain his brain. I just kept up with the training, it was exhausting because he could be so nutty at times. The Maverick started towards the tail end of Paladin's craziness, but I learned not to let him get away with anything and he did not seem to go through it as bad. I would definitely make sure physically she is ok Paladin was at the vet due to a hurt leg numerous times, so I knew he was ok physically. If it is the teenage thing, have no fear, she'll come back.
You just really have to keep at it, and it'll pass (eventually, really, there will be light at the end of the tunnel, just that the tunnel may be long!)