All the fish in that pond stay at the bottom in the winter, its a deep pond and it never freezes completely, so all the fish stay at the bottom together, or most natural goldfish hibernate under mudd in the winter, if I wanted to I could probably find a place for her to stay in the winter too.
I'm sorry if some of you think that its absolutely mean that she is in a pond that is a little more natural than most, but all these goldfish in it have lived there for years and years and always get through the winters for years and years.