Bug or bad design. Stuck After i killed Nettie.

[Arqium]

I was stuck inside her laboratory after I was forced to kill her when she poisoned me. I couldn't find a way out of the room, or any tip for the puzzle there, if there was one. Tried everything.

[khazad_doom]

just click at the doors, they appear to be closed, but you can open then.
in rare cases, you can even walk to doors as if they weren't there.
give it a try, hope it helps

[Sentient Roomba]

you need the crown from Nettie, put it on and click on the locked door(s)

[I am Groot]

You dont need anything even though the door says its locked if you click it it will open.I spent ages looking for a switch and was clicking around the walls trying to find a hidden switch when I accidentally clicked the door and tadah it opened lol...