Hi My Mum Has Cancer In Four Places; Lungs, Lymph

Hi my mum has cancer in four places; lungs, lymph nodes, adrenal glands and bones. She is mainly in a wheelchair as walking far is becoming more and more difficult for her. Today I noticed her foot was swollen and a little cold? Is this common. She suffers with sceladerma too. She has not had chemo since July last year.