Does your mom have CAR (Cancer Associated Retinopathy)? I have Autoimmune Retinopathy (AIR) which is related. You will find a lot of good advice about adjusting to sight loss here.
There used to be a CAR group on fb, but I can't seem to find it now. Here is a link to the AIR group, which does have some folks with CAR:
$1Sending good thoughts to your mom!