Hi meeshlz
It’s possible she made more than one nest. Apparently they sometimes do at hibernation time, but also possible that she is planning on using it later. Not always easy to tell with hogs! She could also be a youngster practising.
I would keep offering some supplementary food and don’t forget the water. It’s important to leave water available for the hogs all day every day. You might find you need to create some king of cat resistant feeding area. If she is definitely a she and has produced young somewhere nearby, she might appreciate refreshments.
