No problem at all. If your W recognizes she is depressed, then I wouldn't focus on that. Instead show her how wonderful LIFE is and have her make the decision if she wants to join it or not. You have to really push the idea of LIFE into overdrive so she can see it.
Here's an analogy. She's standing in a dark hole. She knows she's in a hole. She's not happy, but is fine with staying in the dark. She doesn't need you to remind her she's in the hole. She doesn't need people REMINDING her she's in a hole (that's what the therapist is for). She needs someone outside of the hole to shine a light into the shaft so she can see there's a way out. While in the hole, she might here someone laughing above and having fun. When she hears and gets glimpses of what exists outside the hole, she may get curious and want to peek out.
She'll peek out, then retreat back into the hole where it's safe. You need to continue to draw her out of the hole with light.
Detach your emotions but not your concern for her. You do your own thing and invite her, but you don't push. It's up to her if she's going to have fun or not.
It's a slow and long process, but the fact that she realizes she has a problem is a great first step.
M-43 W-40 2D - 9 and 5
Emotion, yet peace. Ignorance, yet knowledge. Passion, yet serenity. Chaos, yet harmony. Death, yet a new life.