My mom had stage 4 renal cell carcinoma with no major symptom, her left kidney was removed... Pls Pls Pls help?

We found the cancer on a routing medical check up. There was no major symptom apart from the palpable mass. Her left kidney was removed surgically. After surgery, she developed lymphoma(in neck) in 30 days, ascites and pleural effusion in around 45 days, and died on the 68th day from the date of surgery. Did the cancer spread during the surgery?