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I say you should transplant. You can never have enough root space, never. As stated before do it before you switch over to 12/12 as stated before. That way you'll get the most out of your transplant.
As far as space goes. I would just start training her now. Remember that she's going to stretch a bit come flowering, so you might as well get her used to being trained before she really needs it. Plus I'm just a fan of LST over topping or FIM to begin with.
-------------------- Dude she isn't as young as she use to be.