If I had to guess, I’d say he has probably been estranged from her for years. The back and forth was a dog and pony show.
Granny wasn't exactly overjoyed to find out she raised a community organizer and black activist
She allowed no photos of herself and Obama for the last 25 years. This shows estrangement
Obama will win points with lots of blacks if he skips granny's funeral thus disrespecting the white side of the family
Maybe Granny didn’t like BO because her little girl got knocked up by a black man......