Stable sounds good.
I would certainly separate her from the other pigs, even if only in another arc and subdivide the paddock to give her the peace she will certainly require when giving birth and feeding. Its not happened to us, but I have heard of sows stealing the piglets. Either way its very hard to separate mum from babies at weaning without the attentions of 2 more largish pigs attempting to "rescue" the piglets.