Read this strip at gocomics.com.
Lucy is still flexible enough to be used with her earlier, naive personality. Innocent characters in Peanuts tend to be capable of amazing feats, abilities that they lose as they gain maturity. That explains Linus' various skills, Snoopy's occasional reality-defying flights of fancy, and Lucy's skill at shooting marbles here. Like a guardian angel, this ability protects the character from those who would take advantage.
