What Causes Swelling And Redness In Hands And Feet After Standing For Long Periods?

My daughter is a sprinter, pole vaulter, and a swimmer. When she walks for long periods of time, stands for over about 10 minutes (i.e: when singing), or when she is running at practice her hands and her feet swell very large. Her hands turn red with white coloration in lines leading to the tips of her fingers, and she cannot as much as squeeze her fingers. Her feet swell and sometimes its hard to take of her shoes, also they get very hot. After a while of continuously fisting her hands above her heart the swelling will go down. It has really started to worry me. This has been going on for about 3 years.