Need help introducing a female lop to two bonded male & female rabbits

Please can someone give me some advice on how to introduce my indoor female rabbit (1 year) to my two bonded outdoor rabbits who are male & female (2 years)

I want to put the indoor rabbit outside with them and contemplating getting another male so they can be in pairs but all play together.

However the two outside bunnies are very territorial and end up fighting with each other when the indoor rabbi is near them.

Any ideas on what i can do?

Thanks :wave:

this is a thread about bonding trios

http://forums.rabbitrehome.org.uk/showthread.php?317003-Do-you-want-to-bond-a-trio-Read-this-first

i was considering doing it with my 3 but decided against it as i don't want to risk my pairs bond.