Advice for class of 2029 sorority recruitment

My daughter will be rushing this fall. Based on her freshman year experience, her ideal sororities are Kappa Kappa Gamma or Chi Delta. How does the process work at Dartmouth? My eldest daughter and I have tried to encourage her not to make up her mind so early but she is adamant that those are the only two she will be content with. Will letters of recommendation be helpful for Kappa? Similarly, will Tri Delt letters help for Chi Delta although I understand they are no longer together? We are a southern family and her older sister went through rush very successfully at an SEC school however I know the Northeast tends to approach recruitment differently so any advice on how we can best prepare her would be helpful and appreciated.