Help! 4 weeks into flower and girl is struggling

[Ausgrower69]

So before I take this leap of faith Im after some advice!

im 4 weeks into flower, leaves are starting to yellow quite rapidly and droop. Flushed, didn’t help. More nutes, didnt help. Watered less frequently, didnt help.
It doesn’t look like it but Im thinking she is rootbound, however with only 4ish weeks to go is it worth The risk transplanting to a bigger, smart pot?

have a look at these pics and let me know what you think the problem is.

 

[dire wolf]

No pics , but I always make a move to larger fresh pots when all else fails , the roots usually respond to fresh at any stage , but be careful of overwatering and creating a mud zone until the roots can acclimate....
It's tricky but I'd do it
Use a lot of added perlite