Answer:

I'll show her how wonderful life is if she or he still fight and always remember that I'm here by he's or her side when he or she needs me. She can talk or call me anytime that's when he can overcome everything

In this case, soothing words may have no effect to the depressed person. So, better if you will keep silent. All you need to do is be with that person. Stay with him/her. By doing so, your friend will feel that he/she is not alone in the battle. It's good that your friend opens up about her feelings. That would mean that he/she trusts you.