cupsanddowns is a game where one team tries to turn all the cups upside down and the other team tries to turn them right side up. At the end of the time, whoever has the most their way wins. Simple, inexpensive game that could bring a lot of energy.
Self-Esteem booster group activity: Have one girl sit on a chair in front of a white board while the others write positive phrases about them. They cannot peek at what is being written. Take a picture and give it to them.