CREATE TABLE table_name_50 (score VARCHAR, opponent_in_final VARCHAR, outcome VARCHAR, partnering VARCHAR)
What is Score, when Outcome is "winner", when Partnering is "Nicole Sewell", and when Opponent in Final is "Victoria Davies / Kate Warne-Holland"?
SELECT score FROM table_name_50 WHERE outcome = "winner" AND partnering = "nicole sewell" AND opponent_in_final = "victoria davies / kate warne-holland"