What Can Be Done If My Mother’s Cancer Has Spread To Her Brain After Treatment For A Plantar Wart And Lymph Node Involvement?

My mother had plantar wart before 2 year. After they did operation for that. But after that again one blister come from lymph node. Then again did operation and remove it. Then they told no any problems now . Then wrote 24 injections. After already had 16 injections last Tuesday (chemo injection day), her left hand not working and feeling. Next Tuesday left leg also. Then after CT scan they told cancer spread to brain. Please tell me what can we do now?