My puppy likes to sleep in its litterbox?

clean everything immaculately but save some of her poop. put the poop in the cleaned litter box. if she starts going potty, pick her up and put her in the litter box. act happy and excited. if she starts to lay down in the litter box, pick her up and put her in her bed instead. have her lay down and praise her. repeat repeat repeat. training dogs just means gently showing them how to do something 80 times in a row while you praise and reward them.