My outlook on Selen:
So far, Selen has not said anything about returning to streaming, meaning she's still recovering from whatever happened last month. I'm willing to bet she's going to ride out the rest of her contract before abandoning ship.
Since Obsydia debuted in July, I'm going to assume that, if she indeed graduates, she graduates a couple of months before that month (around March-April), based on the prior graduations of Mysta (4 months before Luxiem debut month) and Nina (3 months before Ethyria debut month). The /vt/ leak from last year stated that Selen would graduate
sometime in late winter, winter ending in March. While the leaker ended up being wrong about Shu, they may in fact still be right about her.