Scroll works on the stats screen as long as your mouse cursor is to the right of the scrollbar. I think its a Renpy engine thing, not a "making a game" thing. Other games are worse and make you click a button to scroll.
Also, Jyn is theoretically the only one who could have already known Elizabeth is from Elysium with her Dreamwalking abilities. 13th Sin can use that as an excuse as to why she might not have mentioned it. Plus, she was probably too focused on IMMEDIATELY getting pained upon after noticing Elizabeth, I bet that inferno was at least a bit distracting.