Hm, I keep my does in pairs, well, a trio and a pair now since there is a leftover doeling from last year, if they get along solely depends on the individual characters, and it is easier with duos than with trios. No rules about who teams up with who, they don't care about age, size, traditions, relationships or whatever. It seems that you've got a strongheaded adolescent there.
Another thing is, they need space. Not just area, but divided space so they can get out of each others eyes for half a day if they feel like it. If one doe is grumpy, and shoos the other away, they can take it as an affront that the second doesn't go someplace else, which isn't really possible in a space where they always see each other. That can escalate things.
Each of my groups has two seperate hutches, connected by a tunnel. They get garden time where it's easier to keep distance when there's thick air. But it's all on their terms, I only seperate in real emergencies for 1 or 2 days to not mess up their hierachy. My groups can see each other all day long, that dosn't help with getting along, the second they get accidentially out in the garden at the same time it's an instant Furnado and most times I end up bleeding when seperating them. But they never lived together to start with.
Oh, it isn't really aggression how they sort out their hierachy, even if it can be hard to watch it is normal social behaviour, not fighting - including evil eye, humping, short chasing and tufts of fur flying (males don't really do it that way). If it doesn't work out and the characters are incompatible there isn't much else to do than to seperate. Spaying can help, since hormones play a big role in their behaviour, but hard to tell how it will work out beforehand. There are several good reasons to spay pet bunnies.
In your position, I would neuter the older doe (my free range house bunnies are my buck and a neutered doe) and after that goes well keep trying to find homes for the young ones.
