In my experience 3 to 4 nodes can handle some light. Remember she's still in recovery so I'd pay close attention to how she reacts to that intensity. Looking good though keep doing what you been.
Ill bet those roots are putting in some major major work beneath the soil. I grew a grizzly purple auto last year that was slow in growth for the first 2 weeks, then exploded with new growth. Be patient and good luck. ✌
Did you give it a chance to adjust to the intensity of the sun. Sorta looks like she got burned a bit. Im not the expert but its a thought. I also remember one of my girls looking the same way on a few leaves after I got water on them from a feed. Was around 80° that day.
Im also interested in the same strain and have similar concerns. Running my usual platinum Og and a mango haze this season. Last year I didnt pull my last mango until first week of November.