While Wagenknecht is a member of a party called "The Left", her political views are identical with far-right views. If she founds a new party, then I wouldn't consider it a party "on the far left".
AfD positions: socialism is bad, smaller state, deregulation, strong law and order, no European unification, introduce Swiss-style referenda.
"Far right" (Nazi) positions: socialism is good (it's even in the name), state is totalitarian, run your own street army to destroy law and order, start a war to unify Europe and immediately abolish all voting.
These are opposing positions yet we are told they are the same. It is a rhetorical trick that renders people confused everywhere it is deployed.