Mary,
You and your family are in my thoughts and prayers. It's unfortunate that it took so long for her AN to be found. She definitely has the classic symptoms of a large tumor, and from her symptoms I would probably guess that it is pressing on her brain stem a bit. The reason she is having so many problems is that the tumor is also pressing on the nerves that control her ability to swallow, her balance, and the facial nerve problems.  You didn't mention if she had headaches which is usually the first sign of pressing on the brain stem a bit.ÂÂ
You may want to see if the doctor can put her on a steroid treatment (Prednisone) as that may help with the swelling a bit...it can't hurt. This medicine does have some side effects...so pay attention to the doc (sleeplessness, jittery)..but it's real good stuff...I'm on it now.
Your Mom is in-between a rock and a hard place right now. If they attempt to treat the tumor with radiation...it may swell a bit (up to 35% of patients tumor swells slightly after treatment), and that may cause her more difficulty. Another possibility to discuss with the Docs is a partial removal of the tumor, or maybe even a trimming of the skull by the tumor, to relieve some of the pressure on the hearing nerve. I have read of other older patients that had this done before.
You asked what you can do yourself...become informed for her about Acoustic Neuromas. You're in a great starting point. You'll run across surgery patients, patients that are "watching and waiting" for advances in technology...and like me Radiation patients. I still have my tumor...it just got "zapped" with some radiation. It would probably be a good idea to take your mom to the doc if you see or she reports changes in her hearing, vision, if she has vertigo, or runs a high fever. If you can get a your Mom's health better it could be possible to attempt a radiation treatment (FSR or Gamma Knife) as I have read some posts of larger tumors being treated.ÂÂ
Finally, these are not hereditary... Because your mom has one doesn't mean that you will. I am the only one in my family that has one (both sides!). Take care of your Mom and keep us posted if you need any further info... You'll be in all of our prayers.
Gary