i have a friend of mine that feels really depressed. its been ongoing for months now. they have had several frank conversations with me telling their problems in detail and i try to provide comfort and make myself available to listen whenever she wants to talk. but it seems like it doesn't have an effect. they no longer take enjoyment from activities they once use to. i care a great deal for this person and it pains me to see them so depressed. i often offer them to come along with things i do in an effort to help them get out in the world. some times they come other times they want to be alone.

can anyone offer suggestions to help my friend over come depression?
what else can i do to pull them out of the hole they are in?
i thought about mentioning therapy but i feel this may ruin the friendship and make her reject the world even more.

any advice is appreciated.