I have a depressed friend that I am only currently able to talk to via email. How should I respond to her statements and questions?

So, we can only talk on the internet, but we talk most nights and I play multiplayer games with her, but she, ou course, constantly feels terrible and like no one cares. I know that depression cant be fixed just like that and well, it is going to be unlikely that I ever get through to her, as is the nature of the illness. Trouble is, she wont accept that she is depressed so just thinks that it is the way she is (though I m sure that that is common?). What is a way to talk to her and respond to comments such as you don t care ,and i made the one person who cared about me hate me and i want to die etc? Currently I just repeat that I care and tell her she is wanted, lived etc, and listen to her whenever she wants me to. Is this the right way to go about it? I want to do the best thing for her so knowing more about depression would also be helpful. THANKYOU SO MUCH!!!