She's probably only moved one kitten, because you are always there to stop her! A deep cardboard box works well .... that is what I am using with my foster mom, Emma's new kittens ... which were born on March 12. Momma cats have an instinctive ability to care for their young ..... try not to handle them too much, and just let momma do what she feels most comfortable with! Stay calm and don't worry .... everyone will be fine!!!