Breeding your rabbit because "she is so wonderful and you want babies like her" is just plain silly. Every rabbit is different and your chances of getting a bunny "just like her" are very small. Unless you are raising rabbits for food, do not be part of the problem. Do not breed rabbits.
Spaying or neutering your rabbit will not decrease his/her life span, in fact, it could very well help increase his/her life and has many positive effects.
80 to 95% of unspayed female rabbits will get uterine or ovarian cancer between two and five years of age, and a very high rate of males will get testicular cancer. Spaying or neutering your rabbit will give him/her the potential life span of eight to twelve (or more) years of age. Also, upon reaching sexual maturity, rabbits will often display such undesirable behavior as spraying, chewing, nipping, fighting with other rabbits, etc. In most cases, neutering totally eliminates this behavior.
When the time comes to have your rabbit neutered, it is extremely important to make sure that your vet is knowledgeable and experienced with the procedure and with rabbits in general. A rabbit neuter or spay can be dangerous or even life threatening if improper technique or general anesthesia is used. If the rabbit is older, tests may need to be done to assess liver and kidney function prior to surgery.
Food and water should not be removed from a rabbit the evening before surgery! Ignore this direction if given by the front office staff and discuss with your vet if the instructions come from him/her. Not only do you want to do the right thing for your rabbit but you need to educate for future rabbits this vet may see! Rabbits cannot throw up and possible vomiting is the reason that food is removed from cats and dogs. It is harmful to rabbits and causes a longer recovery time if food and/or water is denied them. The rabbit should also be tempted to eat as soon as it awakes from surgery to assist with the recovery process. After surgery, offer lots of things you would normally consider "treats" in order to help them back on to food!