Anyone you know who plays sports? I'm serious - shin guards spring immediately to mind. First, make sure those marks don't get infected.

My thought: If shin guards are not available, then put an extra pair of loose jeans on over your others when you're going to take her out. Take her out only on the leash, then when you are going to let her loose, make her sit first. If she runs in a circle and seems to be coming to nip, don't run away. Crouch down so your legs aren't too exposed, and catch her as she comes by. "Sit" "Good girl!" then offer her a toy to chew instead of you. Maybe if she has a toy to carry around, she won't even think of nipping? Pups routinely nip each other in play, but she's got to learn you're not a littermate, and nipping you is not an option!

Obedience classes will help, too. Until then, thick socks, two pairs of jeans, and diversionary tactics!