OK, when I posted before, I was in the middle of something, so I didn't say everything I wanted to...
1. Low numbers are *not* a bad thing. When I joined my sorority, we had 12 members; all other sororities were over total, which was 80. Talk about an uphill battle! But we pulled together and now there are about 40 active members in my chapter. So what if we're not at total... we take quality over quantity... and that is the key.
2. "Size" shouldn't matter. You have good quality members - does it really matter that people think some of your sisters might have a few pounds to lose? Does it really matter what "people think" at all? What matters is what lies within.
3. For chapter GPA, I suggest rewards for those sisters with the highest GPA. Reward anyone with an A average - this will encourage sisters to devote more time to their studies.
4. Retention... will hopefully take care of itself, as other problems get fixed.
5. If you have a few drunken sluts as sisters (excuse my being blunt here), haul them before standards. They are bringing your sorority's rep down. Give them a warning, and if necessary, get them out - this will send a clear message to everyone that most of your sisters are not that type of woman.
Like I said... a new member class or two full of good quality women will turn your chapter around.