There is no denying that Sarah is extremely ditzy, and often comes across as an idiot. However, her power definately makes it much easier for the sisters to capture children. Also, there are at least a few times where there sisters could have lived if they had listened to her.

1. When Winnie is trying to remember the last ingrediant to the potion, Sarah tells her what it is, but Mary tells her to hush, and Winnie ignores her. Obviously this was played for comedy, but it was definately a moment where they should have listened to Sarah.

2. After Max dumps out their potion, they have enough left for one child. Sarah points out that that have children that they can use it on, but Winnie insists on using it on Danny. Sarah also points out that they have the book, so they can make more potion. Winnie says that they dont have time, but if the had used the potion that they had left, it likely would have given them more time.

3. When Danny, Alison, and Max are hiding by the place with the garage and the fish, the fish overpower Mary's smell, so she cant smell the children. Mary and Winnie then leave. Sarah stays a moment longer, and it always seemed to me like she sensed that the children might be there.What would have happened if she had said something?