What Should I Do Urgently About Pain And Severe Fatigue More Than A Month After Surgery For Stage 4 Uterine Cancer?

my mother had surgery to remove uterine cancer the size of a volleyball. she hasn t started treatment because I moved her with me and the healthcare system lags, especially for those without any assets. its been 40 days, im worried. last night she complained stomach pain and walked hunched over and in bed, asleep for most of the day. it is stage 4, I have no support or clue as to what I am suppose to do