I would wait until she is at least 4-5 months to get her fixed, she's too young at the moment. Spaying a female rabbit makes them not only happier but better companions. They are less moody, and have better litter habits. It can also decrease things like digging and chewing.
Beyond that it prevents cancer of the reproductive track, which is incredibly common in rabbits over the age of 2. (I've heard over 60% of unfixed females get it, not sure if this is true or the source though)
It also prevents rabbits from multiplying, since there are already enough bunnies in the world looking for homes, and we sure don't need to add to that number on accident!
If you're interested in spaying I would make sure to find a rabbit savvy vet so the procedure can be as uneventful as possible.