Hilda has been sitting on the eggs for 7 days now. I have only seen her off the eggs a few times, once she was free ranging for about 1 hr 30 mins until I got nervous and shooed her back on the eggs.
Since then I have been informed that someone had a hen off the eggs for 12 hours and they still had a few chicks hatch, so I am allowing her more freedom and trying to trust that she knows best :)
I have recently been informed that Lucy and Hilda aren't ISA Browns as the fodder shop told me, but are in fact Rhode Island Reds, unlikely pure. This explaines why Hilda went broody. A source had a Rhode Island Red chicken who was a fantastic mum, so fingers crossed Hilda makes a good Mum.
Only 14 days until I find out!