What are the nutritional needs of an 83 year old woman recovering from a broken hip?

A fellow caregiver asked...

My mother is 83, has recently broken her hip and is scheduled to return to her home. We believe the fall was preceded by her poor eating habits. In the nursing home where she is receiving short term care she has lost 4 pounds in 4 weeks. She probably has lost 25 pounds in the last 2 years. What is the best way to deal with this problem?