The "upgrade fairy" is very fickle! I wouldn't count on her !
If you are cruising soon the ship is probably full and if there were any upgrades available you probably would have heard about them by now.
As colorcrazie said, the chance of an upgrade from an inside to a balcony cabin are very small! If you got an upgrade it would probably be from a lower inside to an upper inside cabin.
And, as The Cruise Guy said, if there are any balcony cabins available, you can pay for an upgrade (at the regular price).
I'm glad you're happy with your Promenade cabin, because that's probably where you'll be !
Hope you and your daughter have a wonderful cruise!
"A truly happy person is one who can enjoy the scenery on a detour."
You may also want to contact your travel agent and see what the cost is to move up, sometimes right before your cruise there may be some left at a decent price. Doesn't hurt to ask...best of luck and happy cruising!