"Reinforce the breakthrough - not the failure." - Soviet Union era Russian military doctrine regarding offensive operations.
Its cold-hearted - but sometimes one has to cut their losses and go in a different direction, unfortunately.
I returned home from work to find this lady clawing heavily, again - locking out some key nutrients (her newest foliage was patterning pale green/light yellow - and her oldest fan leaves were yellow and browning at the edges) - and she showed absolutely no sign of progressing further into flower.
Obviously, I played a big part in that (a soil mix that was too heavy on bone meal - and lacking anything else she needed) - but I suspect that she either was a photo-leaning pheno, or wasn't an auto at all (the seed came from a fairly well reviewed seller - but didn't come into my hands in the manufacturers packaging, which makes me wonder...).
She was at 110 days - and I seriously considered isolating her and adjusting the light to 12/12 - but I would have had to flush her (again!) and coax her back to health.
The main problem with that, though - was that I only have one place to grow in the house - an attic which she shares with a Hobbit on a 18/6 schedule - and isolating her from the Hobbit's light would have isolated her from the attic's heat source (I'm not willing to supplement a second source, up there) - and nights are getting cold, here (down to 8-9C).
Instead, I'll take what I learned (and thank you all for your invaluable input - she wouldn't have got as far as she did, and I would be poorer in knowledge - without it) - and move forward.
The pot has been emptied - and a Bubbleicious from Nirvana seeds is basking between wet paper towel in the warmth of my router.
RIP Berry Ryder (or whatever you were!).