Outgrowing space and not flowering

Hi everyone,

So I am growing a Mexican Airlines from FB in coco with a quantum board and ph perfect AN nutes, and this is the first time I tried topping an auto. She responded.... Too well, she now has an even canopy with dozens of bud sites and I was very excited about it but now its day 31 and she has outgrown her space and still no signs of flowering. I am doing everything in the book, light defoliation, lst, leaf tucking and now also supercropping but still she isnt slowing down! My question is how do I "force her" to flower? Of I start feeding flowering nutes like big bud will it help her transition? Here are the photos

As you can see, there is further horizontal space so I hope she starts flowering soon and that she wont grow much more...

 

[Odissey]

I doubt the nutes will make any difference. She'll flower when she's ready. Top her and prune her if she gets too big!

I topped her once already. Do you recommend topping more than once at this point? I am already pruning the top leaves, one question I have is: is it worth it to remove the lower branches that do not get any light?