Asajj as a Sith?

I'm all for Asajj being a sith so that we can use her under an EP lead. However, Asajj was never canonically a sith. She was an assassin for Darth Tyranus(Dooku), then later she became a bounty hunter of sorts. So if anything she could get the scoundrel or bounty hunter tag, but unfortunately she was never a sith. I know it's confusing because she had lightsabers and used the force, so you'd think that's automatic sith criteria.