First, congratulations on getting this far in Girl Scouts - as a proud father of a Gold Award scout and FIRST alumni, I know it takes a lot of sustained effort and dedication.
Ideas blatantly plagarized from a workshop team 103 did for Girl Scouts as part of a
"Digital Divas" day in 2002:
Electrical
- show participants how to build basic series and parallel circuits with a battery, switch, light bulbs and small motors (finally - a good use for the Mabuchi motor!). Use a
breadboard for this to make it easy to make connections. Try putting circuits together wrong and have participants troubleshoot them;
- use the Mindstorm kit to learn concept of computer inputs and outputs;
Programming
- use Mindstorm kit to program simple motion and input/output such as start, go until it hits something, stop and reverse;