@DeadintheWater
I can't say you're wrong, but just to add to the devil's advocate, pride is probably one of the factors involved in the post-war coverups and whatever else that happened to Tanya, so a private execution might not be off the cards just yet, regardless of how unlikely it is. I do remember Andrew the journalist interviewing a retired general about the Eleventh Goddess iirc who, when questioned if there was something worth hiding about, the general got angry saying that Andrew and everyone else couldn't possibly understand because they were not there. I mean, to any not-very-informed receiver of information that the allies were wiped off the floor, at least tactically, on all fronts by a child years off from the age of consent, that would probably be a point of immense shame for them regardless the details. Then again, within the laws of war and history that I know of, her actions as a Major or maybe even up to Lt. Col. shouldn't be enough to convict her of any war crimes, but I don't that know much of either the historical legal issues of war or the untranslated volumes, so there's that.
With that said, I do personally think Tanya would be taken in by one of the victorious nations, probably the Unified States. Such a victorious superpower would definitely want someone of Tanya's caliber, and they'd probably be happy to have a second God-powered soldier. Post-WW2 was an Allied scramble of the best Axis brains and talents, and if applied to this world's contexts, Tanya's natural talents and ability should be counted among them. Even Schugel got into the Commonwealth, so maybe Tanya would squeeze her way in somehow.