Sorry to hear of this.
I had gamma knife 18months ago, expecting to be back at work within a few days, but it hasn't worked out like that.
My balance has been badly affected, although now it's hugely better than it was a year ago.
I think it's a process that affects everyone in a personal way, some have a smooth, speedy recovery, some it's less so.
I have had a lot of help from physiotherapists, audiologists and from ENT specialists who have tried various things. It's working, but much slower than I'd have chosen.
Some days it's better than others with headaches and balance. Daft example - today my balance has been worse, but it may be that I wore sandals with a different height heel - can't think of any other reasons.
It's just how it is, I found it harder if I thought that I should be better than I was.
None of the above is meant as a moan, or a "failed an", it's certainly not, but it's a variation of how gk can be.
All the best to you and your mum.