AsNoriuanswered grow question 3 years ago I don't want to disappointe you but :
1.I see mold issues, so yes, you need to defoliate for better air movement. Buy biobizz leaf coat and treat her before darkness. Do it at least twice , give 4-5 days inbetween
2. I see deficiencies raising, so two weeks for sorting her before flip is good thought. Branches reddish and woody plus leaves shows a lot of unhapiness
3. You have one scrog level already, try to install second and spread her a bit, otherwise after flower stretch this level will be worthless.
I defoliate a lot, usually 5 days before flip last time in veg. This girl is big and will need it in flower too i guess, but i don't know how well she will develop , so its a guess only, wait, see and act accordingly.
Good luck !