Tell Nan she's been much too nice to that beautiful plant.
If you can, take it outside and divide it in half or even quarters. Pot them up, give away or sell 3 of them and give Nan back the nicest one to pamper some more. I'm sure she'd miss it terribly if it were gone, and this way she gets to keep it, make a little money, and get half her room back as well. Best of all worlds!
There's a reason why they're commonly called "Cast Iron Plant" - it's because it's next to impossible to kill them.
