M.C.
It's been awhile since I was a troop leader but I found the badge books for the different age levels easy to follow. One science idea, if there is a badge for this age group, cut and color rocket ships, attach them to old film canisters, the type for 35 mm cameras, add water then add an alka seltzer tablet and close the canister. The idea is to see how far up the rocket ship will travel. You then ask what other items can be used for fuel such as baking soda or any other item that produces gas.
I believe they also had a sign language badge. Contact Delgado Community College in New Orleans, they have a sign language interpreting training program, students are always looking for activities to use their interpreting skills. You might be able to get someone to volunteer their services for one day and teach the girls how to say mom, dad, hungry and learn the abc's.
Hope this helped. My daugher is 19 years old and was in girl scout till she was 16. She's made some of her best and closest friends through girl scout and so have I. Enjoy and good luck.