Depression In an Older Relative

I have an older relative who I talk to regularly on the phone and visit several times a year. She has suffered greatly from depression since her spouse passed away, and basically finds fault with everything she encounters.  It's hard being supportive as I struggle with my own issues of depression. My main coping mechanism is to look for ways to solve problems but she seems opposed to solving almost any issue that she encounters. I really don't know what to do.