Tiffany Sampson/theories

Once Brittany (assumingly) established the Tri-Var Sorority and threw Heather in her club, it was apparent that the sorority would have a stereotypical preppy and mean girl streak. So how did Tiffany, a quiet, aspiring, bookworm college student, end up joining a Sorority with sisters that had selfish attitudes? Place your theories here.

Theories

 * I think that once Brittany and Heather's personalities were revealed to the university public they became sour, desperate, and started black mailing people to join their sorority. Poor Tiffany was one of them, and under the dominance of Brittany she was forced to join. That would possibly explain her neutral relationships with her sisters (She doesn't like them, but doesn't hate them either).
 * Maybe Brittany and Heather took her because she's a beautiful, but Tiffany didn't know Heather's and Brittany's real personality.