Greg Alan Edwards of SB Nation's A Sea of Blue offered his insight on Kentucky's defensive approach.
The only time that Kentucky got in trouble was when (Mitchell) tried to out think his own plan. Mitchell put A'Dia Mathies on Elena Delle Donne to defend her one-on-one in the paint. Colossal fail. Fortunately Mitchell realized it and started running another guard in low to harass her into having to play against two instead of one. When that happened, the pieces started falling back in-line...Had Delaware been able to get Delle Donne hitting from outside, they would have done it. Jelleah Sidney, though, decided to make her game a lot more difficult. She got in Elena's face, into her dribble, and in her passing lanes, forcing her into turnovers, bad passes and off-balance shots. It was the difference in the game.
Considering that Delle Donne scored 13 points in the first 11 minutes, you could probably say that Kentucky did something to slow her down over the final 29-30 minutes.