I echo all the above advice. I found Aloe Vera 99.9% ( it has to be the 99.9%) gel to be wonderful as a moisturiser, so much better than than the aqueous cream recommended by the hospital. Using that I had no problems with my skin at all.
It is after the treatment has finished that your Mum will feel the effects, extreme tiredness will hit without warning. I drove into town one day, parked the car, walked to the Library (50 yards) thank God there was a chair in there. It took about 10 minutes 'til I could stand up and go to the counter to hand in my books. It is so strange, one minute, fine, the next, exhausted.