Just going of how she look now and how far in you are I would not do any sever training such as super cropping. Maybe you could pull those 4 side brances away from the central cola but to me the look to be getting as much light as possible?
I have no experience with the "pony tail" technique but I have seen it come into play and it looked to have worked very well?
If it was me I would give those side brances some support and let her grow out natural

so far she is looking great and I would say the stretch phase is over? If not it will not stretch much more, then all focus will go into bud production

. They are starting to get a nice trichome coverage and you can see those buds just waiting to explode
Keep up the great work and thank you for the picture update very much appreciated.
All the best
D-M.