Vet was very surprised that the pig had died and thinks its a case of an individual pig thing like an obstruction or something similar rather than something catching, especially as the temp was normal and she didn't have the runs.
We have already removed the other girl, she looks a bit down but I think that's a case of missing her mate rather than being ill herself.
Vet said that so long as she doesn't look ill it's ok to send her to the abattoir on wed as planned