Cameron, that is a very lucky cat, having you taking such good care of her!!
I have a lot of farm cats, and they are always having litters of kittens. I feed them all in an old caravan in the field, and there are lots of cat beds and cushions for them. But all the cats choose to have their kittens in one of the cupboards in the caravan!!! They all manage perfectly well, so don't worry. Don't try and touch or move the kittens, or the cat will think you want to harm them, and try and move them. Also, sometimes mine have one or two kittens, come and eat their food, and then when I check later there are more kittens arrived!!! So, they may not all arrive at the same time. Most of my cats have their kittens very early in the morning, so I have never seen them being born.