According to Squared Circle Sirens, former Knockouts Champion Sienna is officially gone from Impact Wrestling, which the company confirmed by moving her profile to the alumni section on their website.
Word is that her contract expired during her absence due to injury, but she chose not to re-sign. There's no reason at the moment on why Sienna decided not to renew her contract.
Sienna leaves Impact Wresting a former two time Knockouts champion and a One time GFW Knockouts champion.