Reply #1: If her impairment is having an impact on the organization's functioning,

[enough]

you owe it to the organization and to your friend to speak to her very directly about that fact.

Your thoughtful and heartfelt post contains everything that needs to be said to her. She will know you all love her, and that you value her work, and that you are worried about her well- being as well as that of the organization.

It could be a good thing for her to hear clearly that her depression is having an impact beyond just the inside of her own head. It might wake her up a bit, perhaps bring her to the first steps toward getting help.

She's lucky to have such caring friends and colleagues.