[DubaiSis]

Yes, although it CAN happen, I would only expect any real chance at pledging as a senior to be in a colony and since you haven't mentioned one coming onto campus (and I wouldn't plan on it and trying to make that happen now for next year is unrealistic at best) you are really limiting yourself to the really small chapters who are going to be willing to give you a chance. You didn't mention it, but are the chapters who invited you back the ones that were smaller, more "awkward," the ones the other girls didn't rave about? THOSE are going to be your options. If one of those chapters is doing informal, I'd consider taking them up on it. Because of your age, you might want to look at what alumna life is like for those sororities. You may have one year in this smaller chapter where you might well find out they're great girls, and then a lifetime of fantastic sisterhood. But that "top" chapter that cut you this year is not going to take you next year unless something really big changes, like you've become best friends with half the chapter. And even then it's unlikely.