If you crank the window out all the way, you should be able to access the pin or screw connecting the operator arm to the window. Disconnect that, and remove the crank assembly from the frame. It is easy to take apart to see what is really broken inside. Could be an easy fix except for the fact parts are cheaply made. You'll likely end up replacing the crank part. Should be available at any mobile home supply or online parts breaker.
While the crank assembly is removed, ensure the window easily closes fully.
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