My daughter is almost 2 and has had a g-tube for about 3 months. Her whole life has been battles like you are describing, off and on. She will absolutely fight eating for a few weeks, then she'll do great. Then, back to WWIII every mealtime. Her older sister was the same way (still is) but it didn't matter so much, no cf!
I think you are up against some tought situations. One, you have the "toddler control" issues starting. She is starting to realize that she CAN make decisions and have opinions. All kids do this, but, of course it's harder with ours. Also, I wonder if she is just so full from her tube feedings that she just really doesn' have an appetite for other things. Maybe she never really developed one. I know how badly you want that tube out. beleive me, I do. Me too.
talk to your dietician. Can you adjust the tube feedings somewhat to see if you can get her natural appetite to kick in? (They'll tell you no....who am I kidding?). I have found that there is a difference between what you will find between the dietician in the cf clinic and the dietician in the gi clinic, and, a regular old dietician. The regular old one is usually the one who is most grounded in reality and had had some great suggestions for us. The gi one, too. It can't hurt to make a few calls.
As far as rejecting the applesauce, try the flavored ones by Dole and DelMOnte. THey are "chunkier" and have a very different taste. We had to start using them at abut 10 months when Em started spitting out baby food. ANd, like someone said, the more flavorfull the food, the better. WE salt AND pepper Em's food heavily. OH, and spaghettio's and yo-baby every day? Yep, I call it lunch. EVERY day, I kid you not.
Good luck. I know all too well how frustrating this is. Please keep us updated!