We used those bolt into the floor post holders to make a cow byre in a building but we secured the posts from floor to roof joists which made them strong enough to resist Dexters with itchy bottoms. We railed the posts and used sliding rails for access rather than hanging the weight of a gate. You could net the rails to make them pig proof or boarding would be better as HH says. It will keep out the cold winds.
Have a look in the screwfix catalog for the screw bolts etc. They sell lots of pig / livestock gear and offer next day delivery. I have also used the strong, heavy type of 4ft galvanised hurdles for gates but hung so they cant be lifted off. Much of this really depends on just how big and bolchi your pig is but better to be safe than sorry.
Another idea is, depending which building you are putting her in and what else is stored there you might be able to use things like farm machinery or Heston bales etc to add strength to your pen and prevent her breaking through.
You do realise that you will go to all sorts of lengths to create fort knox and she will behave like a pussy cat just to spite you....
But thats us girls for you
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