You can still move it (with care) if you would like. Or let it finish where it is. But first what kind of pot is it in? Fabric pots can just be set into larger containers full of soil the roots will grow right through the sides and bottom. If it's in plastic and if it's full of rootmass, the pot can be slid or carefully cut away too. You just have to be gentle and not disturb the roots very much. Then set it gently into a new larger container with soil in the bottom and then gently fill in around the rootball. I have done it before and there was no transplant shock to speak of. And (next time) depending on when you start, I would make my last container at least 20-30 gallons for outdoor growing.
Either way you go, good luck friend!
I second this, although getting later in to flower I would avoid it at all costs. I did it with about 3 plants this year as well, all smaller plastic pots that were the largest ones I had on hand for my extras, and then decided to just bury the pot halfway in the ground, Luckily the pots I had were all brittle from being outside the last 2 years and they were really easy to just break chunks of plastic off the bottom of the pot (carefully) before putting it in the hole, then broke some off the sides for lateral root growth outwards, and didnt get any shock whatsoever... Granted they were in full veg and growing vigorously, but Ive also transplanted a flowering plant early enough where it wasnt an issue.
TBH Id just dig a small hole, try to get as much plastic off the bottom and carefully set it down and just finish the plant out in this pot. Chalk it up to a lesson learned, and always be transplanting early enough (careful not to just start in a big pot / your final pot if you're hand watering, can cause issues)
You dont want to slow down or stress the plant out right now at all, and there probably isnt enough time to get any significant growth or benefit from transplanting this late, especially since the veg growth will be stopping very soon... if anything I think you would just stunt her. Id recommend keeping up watering very well, get some drip irrigators set up if you have any lying around or can afford them.)
As long as you're providing enough nutrient, water, and sunlight, you can grow some massive plants in tiny pots.. There are many users here that do it regularly...
I wish I had the guys name, Id link you to his pictures... I think he was out in cali he had pics of plants in small pots, but the plants were taller than his 1 story house roof line... It was a tunnel of plants you could walk through...
Then there are other guys who get multiple pounds off of tiny 5 and 10 gal pots outdoors... So weigh your options and decide whats best for your situation. Good luck brother.
@TintEastwood
EDIT: Found one of the pics... It was from his 2017 grow, I knew I remember something about a steering wheel cover, thats what I searched for, Ill link him to this post, hopefully he can post some pics from that year if he has them... Take a look at the pot size(these are set up on automated drip irrigators, so doing this by hand would probably end badly...) The pots look to be like 5gals lol... probably not bc of perspective(Look like maybe 20gals? 25?), but still, point stands...