My Feelgood is a 152 and it's at 25cm where the bindings attach. With a size 6 boot (23.5cm) I still don't have problems controlling it. My Sal is the same width and it's a 148, and my NS is 24 at the same location but it's a 147. My boots do not hit the back of the boards. My bindings do, but not my boots. I still suggest checking the binding fit on the board and making sure it's set up properly. My setup has more angle than her's and I still do not have a lot of board extending past my boot front. What bindings and boots is she riding? Can you post pics of the boot in the bindings?