Mum newly diagnosed

Hi my names Emma,my mum was admitted to hospital on fen 16th with suspected gallstones after numerous blood work and scans also a drain was fitted for the jaundice along with a metal stent, she was diagnosed with this cancer(advanced) 3weeks ago which was an absolute shock as none of us even knew about this cancer they let her out two weeks ago basically to enjoy what she has left I’m devastated I’m her only child and haven’t got a clue what to expect she still looks fine and still eats maybe not a lot like she used to but still good amount she’s only just turned 59, can anyone pleas give me some information about this cancer and how it takes over I’ve tried research on it and still don’t understand it fully thanks in advance, emma.