I would introduce them in an open area such as your living room so that if the young female and the older female can get away of one does happen to attack the other. I have two unspayed females together and they absolutely can not get enough of each other.. I introduced them slowing and had them put their sent on a toy and gave it to the other that way she would get used to her smell... I would also let one stay in a cage and let the other hop up to the cage to see and stiff the other..
People always go 'it never happened' until it does. Rabbits grunting and nipping at each other isn't a good sign and it's not a normal behavior for bonded rabbits - my bonded pair never acted like that. It could unexpectedly degenerate anytime without any warning. In the OP's situation, recommending to put the rabbits together could lead to a terrible accident, especially considering one of the two is a lot younger than the other. Of course, it's a personal choice, but considering the overwhelming risk of cancer, mastitis and unexpected fights for your rabbits (since you are here, I'm pretty sure you must know your rabbits have over 80% risk of developping uterine or ovarian cancer) I can't recommend you enough to get your girls spayed while they are still young and in good health.
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