You need to determine whether each dropout is the same distance from the centreline.

If the ally frame has vertical dropouts which are the same distance from the centreline, you can file one to make the wheel sit vertical.

If the right dropout is further from the centreline, you could dish a wheel to match the frame, but if it's the other way round it'd be pretty stupid.

...Obviously you need to ensure your wheel is true and dished with a straight axle before using it to try diagnosing the frame's condition.