In any case, it's more from the training and the plant needing to recover from the frequent and numerous toppings, paired with light intensity keeping her small.
I started with 24/0. I like the progression I'm getting with the short dark period now, though. With 24/0, it grew so slowly, she'd take a while to reach a point I could actually train her at. If you plan to train, top, etc. I'd recommend giving her a dark period.
Also! The plant roots better and recovers better in the dark, in case you didn't know, so just something to keep in mind for any future experiments in your runs. Cloning, you should give your clones a dark period, and don't give them full-on light. Try to keep then in a spot where they get some light, like side lighting, but it won't root fast or properly in full light.