Her produce record checks out vs. ASB vIV. It also lists an unnamed foal for 1884, so her record may continue in vol.V (I don't have that one...PZ? Can you double-check?).
The article is clearly mistaken - the writer was likely looking at ASB v.I, which only contains her first two named foals. Pretty sloppy reporting, as she'd produced another stakes horse by the time of Harry Bassett's death.
Dupes are cleaned up. Feel free to remove any unnamed horses you find ("King Alfonso Colt", etc.), they are no more welcome here than unnamed modern horses are. You can PM them to me if you aren't sure.