Kathie

There is nothing to apologize for. How sad to hear of your sister's troubles. I wish I did have an answer on how to help her, and I would share it if I did, but I do not.
I never had to be treated for depression but my understanding is that antidepressants take a while to work. Other posters here on OCF have taken them and maybe they will chime in. As for the mouth issues, She may want to try using seltzer water to rinse her mouth, the fizz worked well for me.
The mucous is annoying and hard to reach.

Keep being there for her. She is working through the grief of losing a lot - I know I would have been very upset if my TX had made me deaf. Again, sorry to hear this
Charm