Mary Gauthier has lived a hard life. The Nashville-based songwriter was orphaned as a baby, ran away from her adoptive parents as a teenager and later battled heroin addiction. Gauthier didn’t discover songwriting until she was in her 30s, but music soon became an effective coping mechanism. Her latest album, Trouble and Love, is a frank, yet elegant exposition of her darkest times. But is also an album of healing and redemption that stands as the most powerful work of her career. Gauthier plays Signal Kitchen in Burlington this Saturday, June 7, with Sean Rowe.