What can we do to help decrease the swelling in my mom's legs and feet?

My mom has just undergone ovarian cancer surgery and had a complete hysterectomy. She started 1 chemo treatment but she had many problems and ended up in the hospital for 6 weeks. She is home now but has serious swelling of the legs and feet which make it almost impossible to walk. My dad wraps them in a special wrap every day to help them decrease in size. Is there anything else that might be a suggestion for us to try to get some swelling down? She has gained a lot of weight and it is all in her legs. She can't lift them up by herself.