I'm too scared to trim with clippers, so I used fine sandpaper and did it by hand with my cockatoo...she always let me know when I was getting too close to the quick! She once broke the tip of a toenail off, and since I didn't have any of the real coagulation stuff, I used baking powder on the...
I'd be tempted to do a fine needle aspiration on the mass to see if anything comes out like pus...could be a bacterial infection that you could use antibiotics on. Other than that I have no clue, but you could always sandpaper down the top beak to help her eat a little, just stop before you get...