Ok, update!
I sat her down and told her calmy and firmly that if there was a good reason for us to throw away a perfectly good bedroom set and/or sell it to buy a used, but bigger and more "fancy" one, with money we don't have, to tell me right there. (Insert 1 minute silence). That pretty much ended that discussion right there, as she couldn't really give a good reason.
Of course, the "not wanting to learn anything" problem will always be there. :rolleyes:
