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Well it finally happened unfortunately. She passed away last week. It did in fact seem like internal laying. Hubs didn't think about getting pictures. So all in all it took almost a year for her to be overcome by it. She was a good chicken.If she has a nice plump red comb and she looks healthy and she is spending time in the nest box daily then that suggests she is ovulating. The soiled butt feathers suggest she has abdominal swelling... it has nothing to do with having fluffy butt feathers.... there is likely some swelling below the vent causing the poop to catch instead of drop clear. When birds poop their vent muscles cause the feathers above and below the the vent to part and the lower ones to move into a more vertical position allowing the poop to drop clear. If there is swelling below the vent the feathers are not able to tip away far enough and the poop snaggs
The combination of her ovulating but no eggs being laid and that poopy butt indicates that she may be laying internally. This is where yolks are released from the ovary when they are ripe but fail to travel into the oviduct to become eggs and instead drop into the abdominal cavity. The bird can appear perfectly normal for months, sometimes more than a year before things come to a head and a health issue becomes obvious. Usually their abdomen will become very bloated and they may start to walk with a wider stance as the mass of yolks in their belly starts to push their legs apart. Unfortunately there is not a lot you can do to resolve the situation. Hormonal implants every 3-6 months will stop her ovulating and prevent things getting worse but it is expensive and will do nothing to deal with the eggs already in her abdominal cavity. If she is a pet, some people go this route and it buys the hen another year or two if they are lucky. Eventually the mass of yolks presses against other organs, often the gut constricting it and making it difficult to poop, or pressing on the abdominal air sacs causing respiratory distress or infection sets in which is known as Egg Yolk Peritonitis (EYP)
It would be a good idea to check her abdomen by cupping your hand between her legs and feeling for any fullness or swelling and comparing her to other hens. It is possible the swelling is higher up more directly below her vent. Swelling in that area may indicate Salpingitis which is an infection of the oviduct causing infected egg material (lash egg) to build up in the lower part of the oviduct. The infection is contained within the oviduct and the bird does not show obvious signs of being sick, but gradually as the bird continues to ovulate, the material builds up and puts pressure on other organs. Antibiotics can help in the very early stages but once the "lash egg" material becomes too large to pass and the oviduct is impacted, the only option is extremely expensive and very risky surgery or euthanasia once quality of life deteriorates.
Sorry to paint such a bleak picture but the symptoms you describe point to one of those reproductive disorders which are sadly rather too common in hens due to selective breeding for intensive production. You would expect there to be some swelling or bloat in the abdominal area if either of these ailments have been on going for a while as would be suggested by the lack of eggs since July, although it is likely that there has been a period where she has not been ovulating during that time if she has been through a moult and the body is able to recover a little during that down time, so any swelling may not be overly pronounced at this stage.
