Spotty has spots because of his breeder's poor breeding habits, for sure. Your girl could also have some appy hanging out in that pedigree.
First, though, so many minis are misidentified as far as colour goes in the registry records. Many pinto minis are actually pintaloosa but hiding the appy, there are lots of "roans" who are really varnish roan appys, as well as many "solids" which are not truly soids but have appy characteristics but a "solid" color coat. The appy gene can hide very well, and appy characteristics can take years to show themselves, so many horses are registered as solids that are truly NOT solids -- so are really not what they seem on "paper".
The second problem is with the Sweetwater Farm name. Charles Penland owned Sweetwater Farms and had some wonderful horses in the early 1990's but poor breeding habits -- letting mares run with multiple stallions. So there were "problems" when DNA testing was started. Many horses were found to have not been by the stallion or mare on the papers, and it became a huge mess to get many horses registered. So all Sweetwater pedigrees should be taken with a grain of "salt" -- although the nice thing was many of his stock were from very fine lines -- having Gold Melody direct offspring, Egyptian King and Roan Ranger direct offspring on his farm and breeding. He bought up many herds from some very well known breeders, bringing together fantastic lines -- but what you see on paper may not really be what is true. Even with DNA testing, they only look to see that the baby belongs to the sire and dam if you order Parent Qualified papers -- other than that they just DNA test the individual horse.
So, since Spotty was never "Parent Qualified" when I purchased him -- since I purchased "HIM" not his papers, if you know what I mean -- and I would be a fool to do it now since it would be impossible to find the mistakes and who truly might be in his pedigree, I just "go" with what the pedigree says, knowing there has to be a mistake in there somewhere since there are no appy horses showing in his pedigree according to the registries.
Hope this helps.