Hi Katy,
I am 72 and have had MGUS followed by CDT treatment starting in 2013. I agree entirely with annlynn. During the CDT I had trouble coping with the steroids and the stem cell transplant (June 2014) is tough but at the other side now and fingers crossed, feel fine and have just started going to the Gym to keep the rest of the old body ticking over.
As annlynn states it would be a good idea to provide some food especially coming up to Christmas.
Best wishes to you and your mum