Lionheads are what I breed. As with any animal that commonly has multiple young, one kit is hard on does. They grow large because they get all the room, all the goodies from mom etc. Being that she was a year she had a later start. But do not loose heart. I bred a maden doe at three years old. She had one kit in about five pieces first time around. Took FOREVER to get her bred! Next try she had FOUR healthy kits! The thing about breeding older maden does is that they develop fat around their ovaries and fallopian tubes. This makes it harder to get the eggs to the uterine horn to establish pregnancy. If all parts of the delivered kit are present (no chance of a leg etc left inside mom). I would give her a few days and try one more time. Naturally pregnancy helps get rid of extra fat so it will hopefully be easier for her to ovulate propperly. If I where you I may even diet her a little first. Then when you breed her, return her to the buck as many times as possible in two days. Rabbits are induced ovulaters. When the doe is bred hormones are produced that stimulate ovulation. If she gets bred a few times she will be more likely to ovulate a couple eggs that make it to successful fertilization. If she conceives at least two kits she will have an easier birth. Plus the pelvic ligaments tighten with age if not bred. Even though this kit did not live it also may have loosened her ligaments. I hope this helps!