Yeah I'm sorry but as it stands now she's clearly being set up to be the Arrowverse Oracle. Things may develop different in future episodes, but as it stands now, she's Oracle.
As for that teaser for next week, she's definitely standing unless they did some absolutely amazing camera angle fuckery on the scale of what they did to make John Rhys-Davies look like a dwarf in LotR, when he's actually two inches taller than Viggo Mortensen. Her posture definitely looks different from the beginning of the teaser where her and Ollie appear to be sitting. I doubt they'll actually go so far as her having a pill problem, because that would take longer to develop than a single episode, I think they just tossed it into the teaser to emphasize that she's all PTSD atm.
*edit*
Makes me wonder how much effort goes into crafting these teasers. Like, did they intentionally film a shot from an angle to falsely make her appear to be standing, or did they just accidentally spoil her somehow walking again? Like I said her posture definitely looks like she's standing up in that last shot, it's not just the camera angle, but if it's fake that would mean they deliberately filmed that part of the episode like that just to be able to use the footage to fuck with people in the teaser, and I can't imagine that much forethought goes into teasers.