She 'went into mourning' for her dead husband. [=she began to mourn for her dead husband]
She is still 'mourning' her husband, who died last year.
She is still 'in mourning' for her dead husband.
(..) you know, like a lot of brilliant people, Magnuson had a huge ego, left little room for others. Ah. So no one was, uh, mourning his loss. Oh... look at that. Broken glass. Ah. Light's broken. Hold up. (..)2014 TvShow: Bones Title: The Master in the Slop Season: 9 Episode 14