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My advice would be to have a slumber party or other sisterhood event.

Watch a chick flick, eat pizza, and most importantly, have a heart to heart. Don't address the new girls personally with issues, but tell them that you are concerned that, being newly initiated, your younger sisters haven't had the chance to learn how to run the business side of a sorority. Tell them it's hard work but definitely worth it. Also, tell them that each older member will write specific directions for each office (ie, when to prepare for rush, how to contact a fraternity to plan a mixer, etc.).

Give them ideas and guidelines for a few events to plan (swaps themes, ideas for sisterhood parties, etc.) and let the younger girls plan these events by themselves. Tell them that you know that they can do it, but they will need to start working extra hard since y'all will graduate soon.