Hello again. Mums vary in their cleanliness of their nests. Some keep it very clean and at this stage the babies themselves won't be making any mess. The problem sometimes is Mum herself who will wee very close to the nest and you need to keep your eye on this. I have usually left the nest unattended until babies start to venture out, unless the Doe has been particularly messy then I have intervened. Can you see where Mum is doing her toilet? This cold weather it is best to leave things but top up with soft hay like you are doing and Mum should re-line the nest when she feels it needs it. She is a very young Mum though so take that into consideration. I am glad you've been able to move the hutch into a more sheltered position.