I came across this article this morning

suggesting that perhaps we’d get Lady Stoneheart in season 8. As a primarily a watcher (still finishing the books) I still know who Lady Stoneheart is and I think the show has gone away from that story line. There is so little time remaining in the series that I can’t see the show runners effectively adding Lady S. at this point. If they did, it would most likely be some brief fan-service cameo in a most likely poorly done scene. I’d say leave it alone … take a look at the article and see what you think https://www.google.com/amp/s/www.theringer.com/platform/amp/tv/2019/2/25/18239175/game-of-thrones-loose-ends-catelyn-stark-lady-stoneheart-return-season-8