I'm not sure if this falls within the scope of this site.
Is it possible to remove a stain made from the dye of a couch's fabric from a wood floor?
I have looked online and found different methods, but I am not sure which is the best way.
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It does not make a lot of sense that the dye in the couch came off, although it is possible that some dye was released during a steam cleaning. But if that is the case, the discoloration would extend around the couch and not just be at the front edge of the seat. Before anything else try using stronger detergents on the flooring with some steel wool abrasive to insure that the discoloration is not above the floor varnish. Of that does not work you will have to sand down the surface finish. It may be possible to only remove the top of the finish surface and then apply a fresh coat of varnish (or possibly polyurethane) in that area only, but it will require buffing to match up the area to the appearance of the adjacent areas. If it is still visible, it may be necessary to recoat the entire floor.