I read carefully all your queries and I am sorry for your mom.
With regards to cramping it may be due to chemo therapy, you can disccuss with oncologist
to give her the proper medication.
with regards to constipation
, firstly I recommend to use plenty of water and change lifestyle using foods reached in fibers, Lactulose
is a good choice , it will get 2-3 days to take effect.
but it depends on doses taken from your mother.
wishing her fast recpvery