She usually has an opinion about whatever subject/topic/issue is 'under discussion'. [=being talked about]
The proposal is 'up for discussion' [=the proposal will be talked about] at today's meeting.
After much 'discussion' of the plan, the idea was rejected entirely.
(..) - Michael! We have to do something. Will can be in danger. More reason to stay put. - Mom! - End of discussion. So... me and Barbara are gonna study at her house tonight. - That's cool, right? - No, not cool. What? Why not? (..)2016 TvShow: Stranger Things Title: Chapter One: The Vanishing of Will Byers Season: 1 Episode 1