So we seem to have a week of this, yeah? A funny thought, and a notion that was floated in the previous thread: what if Tania isn't actually being malicious but genuinely trying to be helpful with some weird weight loss concoction that is inadvertently having side effects on Tessa (the bloating, the brain fog memory loss)?
With Saiya visiting and checking on Tessa over the course of the week, now concerned from what she witnessed from the first night, and feeding her, Tania might try to ply Tessa with more doses as clearly something isn't working - she should be avoiding food but she somehow isn't! Her plan for helping Tessa being unwittingly undone by Saiya. By the end of it, Tessa's in fact gained a pound or two and Tania can't figure it out.
It's still not outside of bounds for Tania to be a red herring about Syndicate X all this time.