It sounds as though she was never properly taught to accept and yield to the bit. Everything she does is resisting the bit and she'll continue to evade the bit until she learns otherwise. I'd say she needs professional retraining - unless you've got a lot of experience with starting young horses.
When I bestride him, I soar, I am a hawk: he trots the air; the earth sings when he touches it; the basest horn of his hoof is more musical than the pipe of Hermes. ~William Shakespeare