Poor compatibility please help

[Guinea Whisper]

I'm trying to introduce a new young pig to a herd of three, but there is one pig in particular that doesn't blend very well with her. Since they're around the same age, she isn't intimidated (unlike the other older pigs) and they got into a pretty ferocious rough-n-tumble. I don't want to keep her all by herself, so I was wondering if there was a way I could get them to... not hate each other.

(In case you're wondering there wasn't any scratches or blood, just a frantic nipping fight)

 

[Swissgreys]

It would probably help a little if we knew more details about your current herd of 3 (ages, sex, time together, etc) and your cage set up?

Were all introductions done on neutral territory?
I always find the bonding guides useful at times like this, just to remind me of what to look for and when to decide if it really is not going to work.
Behaviour, Bonding & Bereavement Guides