Hi,
Your mom can alleviate the constipation somewhat by using a version of Boost or Ensure that includes fiber. You can also use a soluble fiber like Benefiber that can be dissolved in water and ingested through the feeding tube. Getting this under control can make a big difference.
My radiation oncology nurse recommended Aquaphor to use on the skin as it became burned from the radiation. I used to glop it on every morning and night and it seemed to improve things. It helped my head stick to the pillow!
Take care, Sheldon