It’s true that we do not allow intentional breeding on this site, and we also make every effort to discourage “oops” litters. That said, it doesn’t help the predicament you are in now. You need to safeguard the babies without their dying from lack of the mother’s care. It may be beyond our specialty, and I would urge you to first separate her from them for a few hours at the moment while you get them some help. Babies are left alone for a while in daylight while their mother is off, so they should be OK if they are already round and healthy.
OK, I just reread the part where you’ve talked to a breeder, and I urge you to work with that breeder to help you. DO NOT WAIT AND SEE.
You already know.
If the breeder is not available to help, then I would start with a call to your vet. Ask her if she can do 2 things: first, examine the mother and get her spayed immediately, or set up an appointment for an immediate spay as soon as it is safe for her after giving birth. This was really inevitable after not getting it done once you learned you had opposite sex rabbits.
Second, ask her how to care for the babies while keeping the mother away, and is it the same as the breeder’s suggestions?
I believe a vet will know what’s safe to do, and when, regarding the babies’ need for mothering. You will probably need to care for them yourself without the mother near them at all, or find a surrogate that will work with the babies.
I would consult the vet first for immediate advice, then, if the breeder can’t help or doesn’t want to take them, call your local shelters and rescues to find one that handles rabbits and especially litters. Many shelters will get a pregnant doe, so may be much more experienced on getting them through the weaning ages until they are ready for adoption. And if there is a new mother in one that lost her babies, she may be able to surrogate. If not, they still may be experienced in raising abandoned babies. And then you will want to have them adopted out, so it would be very helpful for you to get them in other hands right away, leaving your 2 spayed, neutered and your only pair from now on.
If you get attached to these babies, you will need to be prepared for a host of problems, starting with keeping them all separated at a very young age (no later than 4 months) or you will have multiple “oops” litters. I think you need to call this an emergency, and get outside assistance very quickly. I don’t know if any of the babies will survive this mother’s attacks, and they don’t deserve the painful damage you described she did to her first kits. Accept that she is that way, and take steps to save them from further harm.
And it’s clear you love your 2 bunnies, so please take my urgency as concern for the babies, but not a condemnation of your life with them. You are doing the best you can and it’s hard to understand and deal with animal behavior sometimes. Hang in there!