Definitely check to make sure if hay is the problem. I know of more than one person who thought they were allergic to their rabbit, and it turned out to be the hay. They were fine after changing their hay variety.
If it turns out to be the rabbits, you can try discussing this with your vet. Sometimes they may know of a family who can give a rabbit a good home. They do need to remain together since they are bonded, and especially since they are older.
Rescues are often full. Now, it’s been a couple of months since Easter, and rescues are more likely to be full if they are taking in Easter dumps. There may be one near you that could help, though. Here is a list of rescues by state. I know that this list isn’t completely up to date, some rescues may have closed, and others may have opened. There are 3 listed for Virginia.
https://rabbit.org/independent-rabbit-rescue/
I wouldn’t recommend listing your rabbits on Craig’s List or any similar places, as you are liable to get people responding who want the rabbits for reasons other than as companion animals.
I do hope it turns out to be a hay allergy, and that you can find different types and brands that won’t affect your daughter, so that you can keep your bunnies.