Actually, I thought she did -either that or Khaless just decided she liked her and signed her up -which might qualify as some sort of "scholarship" for them.
I'd lean on where Dalvy is going though. Without Val support, since it was rare for Non-Val to go, the tuition of the upper class commoners(possibly sub-house members, Guildies) shouldnt have been enough to keep the school going. Thus either the Sharen were paying for everyone to go, besides the people who bought their way in, or pretty much everyone paid. Unless... the teachers just took positions for altruistic reasons (the rest of the staff being slaves or students) and the kids "allowances" let them buy food etc?