I agree w/ AstroAPhi & Achtung Baby.
Without knowing much about Greek life as a whole on your campus and in your sorority, it can be hard to give specific advice.
Like AstroAPhi said COB is always a good idea! and good PR could help you out!
Go to the library with a bunch of sisters and all wear your letters, or have a day out of the week where sisters get together and eat in the campus dining hall.
