Nrthman,
I am sorry for what you are going through. I'm glad GAL activities are becoming easier. My wife has BPD, so I know the difficulties of dealing with a spouse with mental illness. My suggestion is not to bring up depression. For one, she might resent you for suggesting it and might hiss through her teeth again. Mental illness is extremely complicated and as hard as this is, it is something she needs to work through. Also, you want to be very careful not to give the appearance that you think her depression led to the separation.