She would have to check the zone but check out the blackdragon cryptomeria. It goes taller than 6 feet (8 -10 average) it grows VERY SLOWLY. It is beautiful in all seasons. Dark dark (black green) with bright green new growth. The fruit is a dark chocolate brown. You didn't say how wide.
Checked it out. Pretty. Okay in zone 5 so in a protected doorway probably okay, but according to Avant Gardens' website it grows to 20 feet tall. Kind of too much. Where did you find the smaller version?