Everyone thought she was dead. Zelling is the one who protected her. Zelling is horde. Zelling is Forsaken. Zelling knew she was alive but kept her self hidden.
Everyone chased down by the scourge doesn’t make them forsaken as they where mindless zombies.
The crusade knows she is “alive” and don’t want her to take the throne they want her dead. They Forsake her existence. Scourge is mindless forsaken aren’t.
Forsaken are those who broke free of the helm. She is her own person. Scourge have no will.
You can’t accept she is more horde aligned then alliance aligned.
You can complain all you want but her criteria to be Forsaken fits to be a forsaken. That is the criteria you came up with.