I send my son to a GREAT preschool at Hwy 75 & Wilmith (just North of 380) I don't think they can help you until you daughter is in the 4's class, but they do have a 5 day/week 4's class w/before and after school care. My son is in that class now and it has been a WONDERFUL experience!!
I know this won't help you now, but look into it for next year (if she is 4 before Sept 1) It is called North Texas Christian Academy ###-###-####. Their 6 month to 3 year old classes are only 2 days a week, but they offer before/after school care for them too. They have 2, 3 or 5 day a week classes for 4's and have kindergarten to 6th grade.
Good luck to you!!