That's a GREAT suggestion TSteven!
Seems like the bigger the city, the less active the alumnae group. They're volunteer organizations, and sometimes there's just not that one motivated individual to spark the group.
Keep asking around...there are hundreds of sorority women around you. They just don't advertise. You may find them telling you that your DD does not really need recommendations, but it's Texas and she DOES. Good for you for starting early!
Here's the link to the NPC map of groups:
https://www.npcwomen.org/map/default.aspx
Alumnae panhellenics are the blue pins. Looks like the Silicon Valley group is active. You might query them...maybe they can send your daughter's info to them...they can give it to their member groups to forward to alumnae closer to you.
Best of luck!