Is it close to shore? Chainsaw a trench and winch it out? Even if it's not close to shore, you can chainsaw a trench, then auger a hole at an angle away from the machine a ways away. Put a 4x4 in hole, boards from edge of ice down to machine, hook winch to 4x4 and winch her out / up the boards. May have to do this from the front end, though, if the skis are catching.