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Your mother has developed metastatic rectal cancer
which is very advanced stage of disease. Although this stage is not not curable it is treatable.
drugs are used in combination in this stage.Depending on her general condition and tolerance doctors will prescribe her anti-cancer medication. These may include the chemotherapy agents 5-FU , irinotecan, oxaliplatin
, and capecitabine or modern targeted therapies bevacizumab and cetuximab.
Along with anti-cancer medicine she requires palliative care
for management of symptoms she might be having like pain,nausea,abdominal distension etc.