NEW YORK (AdAge.com) -- Tensions between Rosie O'Donnell and her magazine's publishing partner, Gruner & Jahr USA Publishing, have mounted to the point that the publishing company is considering selling its stake to the ex-talk show queen. "I'm sure Gruner & Jahr would make it attractive" for Ms. O'Donnell to take over Rosie, said one person familiar with the situation. "What's unclear is whether she has an interest in doing that." But this person estimated the likelihood of that happening as being roughly equal with "three or four" other possibilities. 'One day at a time' Asked if Ms. O'Donnell might...