Though rabbits are at a greater risk of complications during surgery because other small size, experienced vets will know exactly what to do and its unlikely that she'll die during surgery. Tons of rabbit owners choose to fix their rabbits, and though rabbits dying during surgery isn't unheard of its defiantly not something that happens often.i plan to but im kind of worried because i don't want her to die during surgery.
Honestly, I would be more worried about her developing ovarian, uterine, or mammary cancer if she doesn't get spayed.
I recommend talking to your vet about it and I'm sure that they'll be al to explain the process and ease any concerns.