I would NEVER tell my daughter that I wouldn't support her decision to join an organization other than DST. To me, that is just not right for a parent to do. I do not want my daughter to be a Delta just because I'm one. I want her to find an organization (if she is even interested in sororities) that suits her needs the best and that she will be productively involved in.
As far as writing checks are concerned, chances are she will be required to pay her own dues just like I'm doing right now. Sororities are lifetime commitments, so why not let her finance her commitment up front since she is going to have to do it for the rest of her life. My motto is: "Don't join/buy/commit to nothin' that you can't afford to pay for yourself!"
Okay, okay. Exceptions to the motto include: car insurance, property taxes, tuition and an occassional "must have" outfit !!!!!!!