Suggest mindfulness practices, such as yoga and meditation. When people learn to focus on the present through mindfulness, they often feel more relaxed and less stressed.
Encourage her to talk to you or other supportive people. Humans are social animals, and depression makes people withdraw. Help her see the value in interacting with others.
Suggest therapy for depression. Your girlfriend may benefit from short-term counseling. Or, she may need therapy over the long term. Remind her that there’s never anything wrong with admitting that she needs help for a mental health issue.
Encourage her to seek addiction treatment. If your girlfriend is trying to bury her bad feelings in drugs and alcohol, professional treatment is necessary in the form of simultaneous help for depression and substance abuse. Without help, both problems can grow much worse.