Her argument comes down to something like "It might maybe help kids from low-functioning families a tiny bit for a year or two." Weak argument. Don't have kids if you can not raise them well, teach them well. We already have free government birth control...
Does Pre-Kindergarten Education Work - or Not?
Wrong, because the true Progressive argument is more unionized "teaching" jobs. We all know that "Pre-K" is a euphemism for babysitting. Prosperous moms use nursery school so they have time to volunteer, get to the gym, and play tennis. And, of course, to get a break from the brats.
"Education"? Well, if your parents can't teach you to speak, count, add, or recite the alphabet, you are in trouble anyway. Blame your parent(s) for a crappy start in life, and get yourself going.