If she has been enlarging the nest she may be planning on having young ones there. They don’t tend to make very elaborate nests at this time of year otherwise. If there are both males and females around, it’s possible for a hog to have early hoglets.
Female hogs with young will venture out during the day, but whether it is to look for food or not, is another matter. They sometimes go out to get a break from the youngsters or if it’s hot, etc. Although, I suspect she would stay with them when they are very tiny. But that doesn’t mean she won’t go out at night as well once they are bit bigger. I would leave food where you normally leave it – that may be where she looks for it. The normal food, i.e. meaty hog/cat/dog food or cat/kitten biscuits and water should be fine.
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Good luck. Fingers crossed for some hoglets!