Don't know what happened to my post I couldn't read it so not sure if anyone else could.
An abscess would be very painful. If someone could distract when she's lying down, good rub or scratch, you might get a look. Use boards for safety.
There's pens and pens. A small pen and you will have to run round less but from what you say it still wont get you far. You need a v shape arrangement with a secure gate or hurdle. Put pig in then keep them in with a chain from the gate across to another secure gate/fence, across her backside. She can't go forward or back. She's be basically caught.
The other option is a pig snare, which the vet may have.