The three judges scored the fight 98-91, 97-92 and 98-91 to the sister of Daniel Dubois, who had dropped her opponent in the sixth after a slow start to proceedings.
Victory means Dubois has now unified the WBC and WBO titles.
"Terri had a good showing and showed why she is a very good boxer," Dubois told Sky Sports. "From my side it was never personal; it was personal for Terri. I am a fighter and an entertainer.
"I put myself out there to show up for you guys, and talk the talk to be entertaining. That is why this fight was the most talked about."