1) I moved her to directly in front of a window.
2) There weren't holes in the bottom of her planter (I know, rookie mistake), so took her out and there was a ton of sloshing water in the dirt. So I drilled some holes, took out some of the soppy soil and put in some new dry, nice topsoil, put her back in and let it drain (TONS of water came out into the tray over the course of 24-hours so I'm assuming there had been WAY too much water sitting in there)
3) When I first got her, someone had advised me to put rocks in the bottom to help with drainage, etc. I did that, but later found out that you should avoid limestone because it's acidic. So I took those out yesterday.
4) I added some fertilizer and some fresh bagged topsoil that the lady at the nursery said had all sorts of yummy plant vitamins in it.
5) I trimmed all the branches that felt dead... the ones that snapped very easily and didn't have any color in the center when I cut them... although I don't' know if I was supposed to do this or if I did it right so any thoughts on this would be great.
What do you think? Is there anything else I can do? Is she beyond my help? When I pulled her out, she came out in one big plug so it looked like the roots weren't growing out. What can I do about that? There are still some green leaves, but very few... like 25. So I'm thinking it's not too late, but maybe I'm in denial. I really like this tree...

I'm a total novice and brown thumb, but if you can help, that would be so great.
Michelle