Hi. I know it says to wait till 3-4 nodes, but my plant is only about 7-8 inches, 16 days old. Today I counted the set of branches, and there are 4. Can I top now, even if she is that small?
As long as the plant is healthy, I'd say go for it. I topped mine at about that same height and they responded very well to it. It'll also give them some time to 'heal' before you flip them to flower.