Prior to my surgery I had no balance issues, only some hearing loss. The AN was pressing on my brain stem so surgery was moved along soon after discovery of the AN. After surgery, I couldn't stand straight without falling over. I didn't want to use a walker but it was the easiest and safest way for me to get around. Once I was home, I could grab from wall to wall in the smaller places and after about a week, was without the walker. Ironically, now that I am on my own, it's easier for me to walk on my own, or if I hold someone, but if say my husband tries to hold onto me, it throws me off (I need to be in control of myself, someone else holding me throws me off). Anyway, the physical therapy for balance does help, and you need to do the exercises in between the sessions as well. After about 8 weeks tho, the therapy didn't help me any more (that's just my personal experience) and it was more of a time heals sort of thing. Good luck to your Mom, and it's good that you are thinking ahead. I never imagined that I'd be using a walker after my surgery because I had no balance problems prior to the surgery. Never say never!
~Karen