To find the highest number of points that MJ can score in a game, we take her average score and add the maximum fluctuation.
MJ's average score is 52 points, and her score can fluctuate by 11 points.
To find the highest score:
\[ \text{Highest score} = \text{Average score} + \text{Fluctuation} \]
Substituting the values:
\[ \text{Highest score} = 52 + 11 = 63 \]
Thus, the highest number of points that MJ will score in a game is 63 points.