Sisters of DST - Help with a Delta Question

[Sistermadly]

I hope I'm not stepping out of line here, but I could use some help. I'm writing a young adult novel (for the first time in my life) and in the novel, one of the scenes involves a young black girl who has a fight with her father because she wants to go to a social event sponsored by the DelTeens, but her father doesn't want her to go. It's the last fight she and her father have before her father passes away.

I've done some Googling and found some information about DelTeens, but one piece of factual information is kind of holding up my flow - does a young woman have to be sponsored in order to join, or can she simply submit a letter of interest to a chapter?

Again, pardon my ignorance, but I want to make sure I get this factually correct. If the novel ever sees the light of day, I'll change the name of the sorority. Feel free to answer this via PM or via e-mail if desired.

Thanks SO MUCH in advance!