ok,
a few things
You should keep in mind that some people in the sorority may really want you, and others don't etc. A sister may not always be lying when she acts like she is into you.
Also, during rush, just be yourself. You can get a lot further this way, and are a lot more comfortable, be as confident as possible. Other things I can think of, if the same girl rushes you at each party may be a good sign, and if you are introduced to a lot of sisters that may be one too
Hope this helps and good luck, but go for the chapter you want. See what is all out there before making a decision.