Bonding a female rabbit to an established group of 4.

I have been asked to bond a spayed doe to a group of 4 bonded buns. The established 4 are a male and 3 females, which I bonded a while ago. The lady who has these 4 buns has recently rescued another bunny, got her spayed and is part way through her vaccinations, and wants me to bond the new bun to the 4 others. I am more than willing to give it a go, but at the moment I do not have room - I am choc-a-block full of rescues. Everybun is indoors at the moment, and will be throughout the winter. Rehoming is slow, and I cant take on these buns to bond until I have room.
I wondered if anyone on here in the north east will be willing to take on the job of bonding these buns for me?
I have been trying to pursuade the owner to have a go herself, but she is too nervous to try it.
can anyone help??
jan

Sorry, too far away!

My north-east is much further north than you!

Hope someone can help or the owner gets a bit more confidence.