No problem man, that's why this forum is here for and I'm glad to help
When I was a beginner, I was too afraid to top the plants, and when I wanted,they were too old. So I am not wondering why you hesitate to do so. If you top the plant it "slices" the stem in half so instead of one "top bud" you will have two, and I would say that it would be easier for you to just top it, and then watch how the plant grows and learn from it. Your plant is still in vegetative stage and she is young, so I wouldn't be against topping it
edit: oh and one IMPORTANT thing - top/fim/cut them in the night, never during the day. The plant always gets a small shock due to hormone recomposition and it's best to top her when she's just "resting" instead when she's processing sunlight into growth and O2