If you are in an area that has an panhellenic association, I would suggest that you contact them (shortly after the first of the year, those Texas Pan groups are highly organized) to let them know your daughter will be going through at OU. They can be of great help. In my experience, the Texas groups always send organized info to out of state schools and are good about following up, etc.
Often, those groups will sponsor an informative tea or meeting, and that would be a good thing to attend.
Good luck! My daughter pledged three years ago. Recruitment is often harder on the moms than the daughters!