Luna only got out of that hell because a year after they were married, they were visiting a dragon reservation, and Macnair was eaten by a Hungarian Horntail that had inexplicably escaped its enclosure. Lucky for her, a few months before that, they had met Rolf Scamander, the grandson of the famous author Newt Scamander, on one of Macnair’s hunting trips, and he had grown fond of her. Rolf happened to be at the same reservation at the time, and as soon as she was (literally) back on the market, he sank most of his family’s substantial fortune into buying her up and married her within a week. They immediately went on a honeymoon to South America and never came back. For some reason, the Death Eaters are under the impression that they were both killed by a lethifold, but then again, they also think Macnair’s death was a complete accident.