Hello again, Claire:
While outcomes can never be absolutely guaranteed, she's healthy and I expect that your mum will pull through this just fine. The waiting (pre-surgery) can be extremely difficult, as you know by now. The day of the operation is a long one for all involved, except the patient, who is 'asleep' through the whole ordeal. Your mums' first day or two following the operation may be a bit stressful, too, as everyone naturally wants to know "how did she do?". Mum will probably be somewhat lethargic (and thirsty) immediately following the operation. That will be primarily an after-effect of the anesthesia she'll be given during the surgery as well as her body demanding rest after enduring a traumatic assault, which is how our bodies react to invasive surgery, even when it's done for the purpose of making us better. It passes after a few days, although the effects may linger a bit longer for some.
If all goes well, your Mum will be walking around within a few days and discharged from hospital soon after that. Recuperation at home will consist of a lot of rest, some very mild exercise and working to regain her balance. I know she'll appreciate the support of her family, both during and after the surgery. You've certainly done what you could, Claire. I commend you for your efforts on behalf of your Mum. I wish your mum, you and the rest of the family all the best and of course, I'll be praying for her. I already have.
Jim