So.....
The result of impatience, low humidity and light stress.
The above factors have caused poor seedling growth and development, she skipped veg and went straight to flower.
Even if I gave her the best conditions now, I doubt that I'd get more than 14g dry. Not the first time I've done this!
Goes to show, patience and planning are critical to a successful grow.
Stretch looks almost done and the side branches are non existent.
I can guarantee that this is grower error and not down to seed stock.