Got a picture? that would help a lot. If she really is egg bound and can't release her eggs, there is nothing you can do. Since koi did spawn in your pond this year and she is still holding her eggs, she may really be egg bound. Fasting her for the winter might help, but it might not. She could have a tumor too, which is also non-curable. That's the downside of female koi...they can have these health issues from time to time.

I am sorry for the cloudy photos. I went out today and in the cooler weather it clouded a bit. I need to do a filter cleaning as well.
Troy
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Yep....because of where the bulging is, it's definitely either egg bound or a tumor. Sadly, there is really nothing you can do. She might pass them, but it's not too likely. She looks like she may have some other issues too. It's hard to tell by the photos, but what are those white splotches on her? And are her fins raggedy at the ends? Could be something bacterial going on as well.

Can I give you a bit of unsolicited advise? Get the rocks out of the pond. Rocks harbor all sorts of decaying debris and anaerobic (bad) bacteria. A rock bottom pond is VERY high maintenance because the only healthy way to keep it is to remove the rocks yearly for a total cleaning and sludge removal. Many pond builders will try to tell you that the rocks are necessary to create a "natural ecosystem", but true koi hobbyists will tell you that a natural ecosystem is impossible to achieve in a closed, liner system. You can't duplicate nature in a liner pond. The responsibility we have as fish keepers is to keep their environment as clean and healthy as possible. That is just not possible with rocks in the bottom of the pond.

Thanks for the reply. The white spots on here are actually part of her pattern. That is one of the things that drew me to buying her. The tail fins are intact and look great. They are black with some clear finage on them as well that can make them look a tad ratty but they are in good shape. I talked to the pond shop yesturday and they told me to let nature take its course as there wasn't much I could do with her anyways. So I guess it is a wait and see kinda thing.

Troy