We've not seen much of Tess because her character arc has been tied with Clone Lex's and I'm betting that Cass will have more impact in the second half of the season. I'm starting to think that damn story is going to end up being true and we have a new deus ex machina revealed about her character, sigh. They should have fleshed out her character from the start and already knew what they wanted her to be. I think she's still controlled by Granny in secret, those tears weren't tears of relief or joy at the end when Clark and Ollie made her Watchtower 2.0