Hi. Serious rabbit breeder for 3 years here. This is probably normal. Many rabbits do not have the mothering instinct during their first litter, especially if they are particularly young (under 8 months) or old (over 2 years). Sometimes the litters are really rough. Most people find that only about half of all first time moms birth and feed their litter successfully. Sometimes second time moms have similar problems as well. We have a three-strikes rule for rabbits in my rabbitry because of this.
Sometimes litters are not very big. Even a large doe can have a very small litter. It can take a day or two for a rabbit to finish giving birth. Don't be too surprised if you find that she has tried to eat the dead kits as well if you find any future ones are in pieces. This is also common... She is probably just trying to recycle her lost nutrients from a botched litter. There will also probably be blood, to the tune of about a tablespoon, which can look like a lot when it's spread out. She will most likely try to reingest the blood and placentas too.
Remember, we don't talk about it but 1/4 of all human pregnancies end in miscarriages and stillbirths too. This is a normal part of nature's cycle. If it continues through her third litter, however, it's time to retire that doe from your program because she's not suitable for breeding.
So just give her some space, some quiet, some dark and keep an eye on her from a distance. Make sure she has fresh hay and water. And don't be surprised if you wake up and find more kits. Rabbits can also hold in their kits and stop giving birth if they feel uncomfortable. Most rabbits won't give birth in front of you for this reason. So she will need that space desperately to finish her labor.
Good luck!
