Why doesn't Asaj Ventress have a Sith tag?

Mother Talzin speaking to Assaj Ventress S4 E19 “You must give up the ways of the Sith”

I would thing that Mother Talzin would know better than any of you if Assaj was learning the ways of the sith. She has more of a right to be called sith than Savage. She was even trained by jedi before Dooku found her.

Edit: I don’t care either way. Still don’t have her unlocked and probably won’t for a while.