She seems a lot better now, I've changed their bedding in case the other was getting too compacted and hard.
While it was doing this, which they thought was a great game they chased each other round the enclosure so probably not much wrong with her, if anything. She's now sunbathing and hopefully will be chomping at full speed later on when I feed them.
I could do with adding this saga to my previous post "pigin 'eck " still I suppose it's all part of the fun, I did wonder if, had this pig been part of a herd of 50 in a commercial farm, would this have even been noticed?
Thanks all for your input and interest.