See the attachments below for discussion ideas by program age level to get girls thinking about giving.
Be sure to adhere to GSSEM Troop Money Earning Guidelines. We don't normally raise money for other non-profits, service and or materials are usually provide. Exceptions would be natural disasters like Hurricane Katrina, Japan's earthquake and tsunami, etc. See Volunteer Essentials - Part 4: Money Management
http://www.gssemhub.org/sites/default/files/document/Money%20Management%20sept%201%202013.pdf