If you want to get out a map of the suburbs of south Dallas County, you will notice Cedar Hill straight down HWY 67 just south of Duncanville where another tall post prospect is from.
http://www.countymapsoftexas.com/dallas.shtml
The city borders on the east to DeSoto, the home of Chelsea Gardner and Glenn Heights, the home of UConn's Moriah Jefferson. Glenn Heights isn't really even a city, more like a bedroom community with a huge mobile home park. Right across 35 from DeSoto is Lancaster where about a half dozen OU football players have come from in the past six or seven years. DeSoto, Cedar Hill, Dallas Kimball, and Dallas Carter, both of which are just north of DeSoto, are hotbeds of OU football recruiting. Marcus Green and Adam Shead are both from Cedar Hill. We recently graduated Jackson, a DB from DeSoto, WE had several from Carter about seven or eight years ago with another arriving from KImball. Lancaster has given OU Johnathan Hurst, Quentin Hayes, Dakota Austin, and now Dominique Hearn, among others in the past five or six years. There was a freshman this year who I think left because of grades.
The point is that this is an area of Dallas County in which OU is widely accepted. She would know others who have been to OU, or may now be at OU. Indeed, she has two from her highschool that are at OU presently..