Not sure where you are stuck at, but her 2nd quest requires you to do the What if quest after you finish dad and marina's quest. Super not intuitive and not listed on the walkthrough anywhere ingame, only reason I knew it was from this thread.
On a totally different note, anyone else have the cheats break during the island section? Pretty much makes it unplayable since each scene requires you to do something 4-5 times before a scene triggers, each time using 25 energy and the only energy recovery method wastes an hour and only gives back 10. I know QSPs are grindy but this island is insane without cheats. At this point, i feel better off just blazing through it to finish the mom quest, rather than trying to see the scenes there (of which there are a good amount)
I can edit the energy using the qsp save editor, but its a massive pain and doesn't really fix the time issue.