I am glad you feel comfortable posting here.
I agree she needs to work on her issues and what is causing her to feel depressed, how to deal with depression and if she is to be on meds she will need time to see how they work.
IMHO is she is not in a better place herself she will not do well in marriage counseling.
Don't stop believing.
I agree you may benefit from a counselor of your own.
Blessings to you