Did it continue? Continue in the northeast and die out in China proper? How was it remembered, and how did it fit into the court's image of its origins? Was it ever referenced in dealing with Chinese practices of widow suicide? And what is the history of widow sacrifice in China more generally? English language reading recommendations would be appreciated too.
You're in luck here, as the shifting place of widows in Manchu society and culture has been the subject of a 1999 article by Mark C. Elliott, 'Manchu Widows and Ethnicity in Qing China', which I was going to base an answer on but seems, as of writing, to be open-access via Elliott's section of the Harvard website, so I will forego the potted summary and point you to the source directly. It's around 40 pages with footnotes included, so not a quick read but still a relatively brisk one.