Unfortunately this is not all that uncommon. Your breeder didn’t do their job very well and you have an unstable auto cross. Your space looks totally maxed out already, flipping to 12/12 will almost definitely cause flowering to start, but I don’t think you have the space for it without majorly cutting back that plant which presents a whole different set of challenges for a plant you are about to send into flowering.
I guess you could do some extreme topping and continue to veg for 1-2 week and they try flipping to 12/12. It’s a tough call, I am not sure what your best course of action is.
It’s painful to consider, but if you don’t have a larger space to move her to for flowering it might be best to start over unfortunately.
Good luck!