GSD pup barrels down 4 steps between kitchen and den

My 13-week-old female GSD is fine going up the four steps into the kitchen from the den, but she is clueless about how to go down. She wants to charge down, and if not on a tight house leash, she will try to jump the last two steps, resulting in a crash. After seeing her do this once, I am afraid to let her try it without walking by her side, with the leash taut. This keeps her from leaping and flying, but it doesn't stop her from tumbling down the last step. I have found nothing useful which actually addresses this. Any ideas will be appreciated.