[annabella]

Personally I find it a bit odd when people "red shirt" a sorority, but a lot of that is my campus culture.

Here's the thing: if you're taking more than four years to graduate, you probably need the extra semester(s) to really focus on school, not sorority. If your degree program normally takes people more than four years, it's probably a +1 Masters-type thing, i.e., you're technically in grad school after 4 years. So you shouldn't have enough time to devote to being a sorority member anyway.