Connie was a girl who decorated the Christmas tree at Donna Noble's wedding reception. Donna later took her away from putting baubles on the tree because the Tenth Doctor suspected they were bombs, (TV: The Runaway Bride) as they were when he previously met the Roboforms. (TV: The Christmas Invasion)
Later, when the Roboform Christmas tree attacked, Donna checked in on her and Michael immediately to make sure they were alright, once the Doctor saved the party by the use of his sonic screwdriver. (TV: The Runaway Bride)