A rabbit can't "refuse' to give birth, or willfully 'hold back' the kits. However, it is possible that a kit could get hung up because it is so large, or the doe's contractions may just not be strong enough or organized enough to get the kits delivered. This is a mechanical problem, and not something the doe can control. There is a shot that a vet can give the rabbit to help make the contractions stronger, but it is something that should only be given when labor is actually underway, because using it to try to start labor can kill the rabbit. For this reason, only a vet can give it.
If this rabbit simply has inefficient labor, she is always going to have kindling problems, and you really should rethink your plans to use her as a breeding animal. It could get ridiculously expensive to take her to a vet every time she kindles. Retained kits may or may not be a life-threatening situation for her, at minimum, a retained kit could mummify inside her and render her sterile.
Overweight, out of condition rabbits can have kindling problems simply due to lack of muscle tone. Of course, fat rabbits often won't breed at all, or fail to get pregnant even if they do accept service. In addition to all of that, being fat makes a doe more prone to pregnancy toxemia, so it's a good idea to keep a doe lean and fit if you are thinking about using her as a breeding animal.
Sometimes even otherwise friendly does can become 'touch me nots' when pregnant, though it sounds like this rabbit may be a bit territorial about her space anyway. Honestly, the things you have said make it sounds like you don't like her. If that's the case, perhaps it would be better for you both if you rehomed her. This sounds like a stressful situation for all of you, and if this rabbit is likely to bite, the next person who gets bitten may be one of the kids.