Using my calipers, I was able to tell it was quite distorted, with the upper torso much too long. The weight have pulled down on the wire spine.
So I cut her up and removed her, shortened the spine wire in the torso and re-bolted her back into place. Hopefully I have it tight enough now that this won't repeat.
Because she's floating the weight is more of a factor - if she where standing and supporting her weight it wouldn't happen as much. But I won't be sculpting the fabric support until later. You can look back into earlier posts to see the maquette that I'm working from.
I'll be taking time on Friday and Monday to chase the waxes for my bronze Harriet Tubman and Waiting on the #9 - then back to working on this pose on Tuesday.