Topping

I don't see any reason why you couldn't. Plant looks healthy, i normally wait until the 4th or 5th node and it looks like that's where your at now.
 
When I top my girls to build a manifold, I usually let them get to 5-6 nodes and then top back to the 4th.
It's also when I use that cutting to make a clone so I retain the genetics if it's fire.
 
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