I'm sorry to hear that your girls dropped after preference. All of the houses at Texas A&M are strong and the sororities at A&M are wonderful about supporting each other.
However, there are many other freshman leadership opportunities (FLOs) that might be of interest to your girls. It is another way to get involved as a new student to TAMU.
Here is a link:
http://firstyear.tamu.edu/getting-involved/