Wow! She is one busy child! There's nothing wrong with her trying so many different things. In fact, it's wonderful she wants to do all of them. Don't worry about giving her some kind of direction. She'll decide what her real passion is eventually. She's only 11.
If she's not interetsed in Girl Scouts anymore, that's no big deal. She's trying to fit in with a new group and maybe she's just lost interest. I dropped out after I completed Brownies & never made it GS- just not my thing, I guess.
As far as buying expensive clothes is concerened, I would still let her go shopping with her firends, if she wants, but maybe explain to her the money situation if she doesn't already know it. Someone else mentioned giving her an allowance. If it's possible, I think it's a great idea! I earned an weekly allowance and saved up to buy things I wanted. Plus, it helped my mom out! I dusted, did some laundry, washed dishes and ironed clothes. This way, she would learn the value of a dollar, too.
About having "too much" free time...Please make sure she gets a little time to herself. She's so busy right now & EVERYONE needs some time to just relax & hang out with friends.
Good luck!