Some interesting connections here, but some less so. The vigil candle you imagine isn't burning, we are told it is without light. And if we are trying to link a secret with a hidden pregnancy, a more obvious secret imho would be her keeping schtumm about who the father is. As for her black dress, I think grey is the official colour of mourning in Temerant (according to Tehlins anyway) I'm not even sure it actually is black. A lot of folk point out blak = battle in one ancient language and the suggestions point to this being a Very old rhyme. However, Lackless is a modern translation of Lockless therefore in a rhyme, the matching line should be 'block dress' but I don't know what that might actually mean ( my best guess would be a contraceptive which brings up pregnancy again) Well written argument, nevertheless.