If 2 rabbits are raised in the same cage and are used to each other they won't fight, however a new rabbit will sometimes fight if caged together with one it's unfamiliar with.
Placing two female rabbits together is not a good idea. While they are young they may get along well, but once they reach maturity they will begin to fight.
When raising rabbits it is best to have one cage for each rabbit to prevent fighting. Fighting usually occurs with males but can occur with females also.
Only if they are not spayed. Rabbits are territorial. Especially females. There is however a trick you can try. Place both rabbits in a carrier and take them for a drive. It "scares" them into liking each other.
Female rabbits can be bonded if they are young and litter mates better than males. Two females will never fight,it they look like start fighting spray water on their face.