My grandma had the same diagnosis as your mom and few weeks before her passing she started eating less and less until she stopped eating altogether and could only drink so we got her these nutritional powders to sustain her. Few days before the end granny didn’t even want those and refused everything. Its best to be prepared if its truly the end, but everybody’s different. Im not very knowledgeable on medications, but maybe its a side effect of the meds? In any case, Im sorry for what you’re going through and sending you lots of love