Have you talked to your pledge trainer (or whatever the term is)? I know that it can be difficult when you have an "uncooperative" big sister. With that many new members, it's possible that your big sis, unfortunately, may have been asked to take a little which she really didn't want. But she shouldn't take it out on you.
Are there non-sorority things like classes, family, boyfriend, etc. that are taking her time or has something happened in the sorority that makes her not want to be more active?
Perhaps this is one of the things that you could talk about in your NM meeting. I'm not sure if the 115 is total pledges, but even with 40, there may be other NMs that feel left out as you do.
By discussing the situation, it will alert (but they should already know) that you and maybe others are having concerns.
Best of luck to you! This experience should make you want to be a terrific Big Sister when you get the chance!
