Thanks for the reply.
The babies are here now anyway
I ended up putting the whelping box on the bed at night so she would sleep in it and then moving it back on to the floor. She still tried to have her pups in the washing basket and then under the bed covers though! We ended up covering the bed in sheets and bringing the box on to the bed at the time of whelping just to keep her calm as she was getting distressed trying to get up!