Since her spay, shes been eating less than she does otherwise, and also, it took a while for her to start eating. This is normal after surgery, a spay is after all a rather big operation – but it means there’s less food in her intestines. That leads to smaller and fewer poopies, they can be oddly shaped and dark in colour perhaps more moist than they normally are etc.
It’s really good that you are keeping track of her poops. It can take up to 2 weeks for the poop to get back to normal size, shape and numbers. As long as there’s gradual improvement, this is normal.
If she stops pooping and/or eating you should contact your vet, they can give fluids and gut motility drugs to get things moving.
So far you have been doing great, so just keep doing more of the same thing: Encourage eating, its lovely that she will eat from your hand, keep a close eye on poop and pee and make sure shes warm and comfy.
As bunny parents, we tend to worry when our babies are poorly. Its normal ?