Was/is she a tobacco user?
Has her cancer cells been tested for
HPV?
Where is she being treated?
What have they recommended?
IMO these need to be answered before one can even begin to understand what may be going on inside her emotionally. Obviously no one wants to be told they have cancer and I assume she was Staged a III but there are potentially many treatments options which could determine how she copes.
Also try and get her to join this site as she could gain invaluable information that she will never get outside this site and she may well get misinformed by even her treating doctors and nurses.