A.
Hi J.! I take my 18 month old to Lakeside Montessori Academy in The Colony. I absolutely love the way they treat him and how much he learns. He was going to a regular day care and since he's been at Lakeside, he's picked up SO much. It is a bit pricy, but nothing like Kids-R-Kids, or some of the places in Dallas. We pay $170/wk, but since your daughter is 4, it will be cheaper. You should go for a tour if it sounds like something your interested in :) I hope this helps!
~A.