After she has her first litter I would spay her.
If the rabbit is a pet, yes. If the rabbit is intended to be a breeding doe who keeps having babies, then no.
Also, you should have her inside when she gives birth, much bigger chance that the babies will survive.
Huh? I've had lots of rabbits have babies just fine outdoors. Safe cage, safe nestbox, check on occasion but don't pester them too much.
I always figured the worst thing to do was upsetting the doe by changing too many things. So wherever the rabbit usually lives is where I think she should have her babies.