I'm sorry that you're both going through this. You sound like an amazing partner, to be willing to go through this with her and to be so supportive. I agree with the previous posters that you're doing all the right things. There's no way quick and easy way to recover from mental illness, so all you can do is to encourage her down the right path. Keep supporting her, and understand that when she gets defensive, it's not because she's unhappy with you, it's just because she is hurting.

How do you think she would feel about you going to therapy along with her? Having a one-on-one conversation with a therapist was always very intimidating for me, so maybe having someone by her side would be helpful for her.