~I need some Help~

I have been trying to no avail... I have tried all I can think of to get a decent shot of Lexi playing basketball in the gym. I know how to photography speed but the gym light is messing me up. If I just for action it's to dark. Then when I up my ISO its to grainy.. Any ideas would be greatly appreciated.
Extra is Emilie and the 2 pictures she did. The mountain one was done with water colors and the one she is holding was done with pastels...