Unfortunately, welcome to the realities of growing auto flowering plants.
Problems like this put me off for life, of growing autos - highly unstable genetics and strange growth seem to be a part of auto flower cultivation that some growers seem happy to accept, but after experimenting with autos for a couple of years, I decided the risks involved with getting strange plants was too high and have abandoned auto flowers altogether. I had more weird plants over those 30+ autos than I have had in 35+ years of growing normal photoperiod plants. With photoperiod plants, it seems you might get a truly "weird" plant every 5-8 years or so, but with autos it seemed to be about one in every 3-5 plants is weird. Too high the ratio for me to waste my time and effort on them any more.
Sadly there is little you can do with your GSC plant, other than to continue caring for it and learning a bit about auto flowers. She will not recover and give you a harvest you will be amazed about. Yes, auto flowers are not all they are made out to be. If you are lucky, you might get enough for one joint.
Not a lot of reward for ones effort. Growing autos outdoors gives an even higher variability in results!
Personally, I would suggest sticking with photoperiod plants - much more stable genetics, better yield, greater potency and if growing indoors, harvests can be had using vastly less electricity, using a typical 12 week cycle for example.
That is -
Photos = 4 weeks veg at 18 hours, plus 8 weeks at 12 hours for flowering = 1176 hours of lights on,
versus,
Autos = 12 weeks at 18 hours = 1512 hours of lights on.
Meaning, by growing photoperiod plants you will save 336 hours of lights on time against auto flowers, over a general 12 week cultivation cycle.
I know which electricity bill I would prefer to pay!
Combined with better yields, easier cultivation, lower risk of genetic problems and generally more potent plants, I personally wonder why anybody would choose to grow auto flowering plants over photoperiod plants.
Again, personally, I hope autos will fade into history as a comical passing craze; or for the breeders to step up their game and do truly offer a far superior and genetically more stable range of auto flowering plants. I believe in their rush to get "products" on to the market, genetically stable plants have taken a back seat over having seeds to sell, without the correct procedures in place to ensure the auto plants will actually be an "A Grade" quality and stable line of plants. Perhaps the breeders are all too greedy to cash in on the auto craze, that the development process of breeding guaranteed stable genetics has become a secondary concern, one they can escape from their responsibility of by saying you/me/we as growers did something incorrect and unless we did things perfectly, they are not to blame for the weird auto flowering plants that you/me/we have been spending our money on to harvest, what we all thought would be an easy harvest of premium flowers, but unfortunately have outcomes whereby after much care and effort, we end up with plants that barely produce enough flowers for even one joint. By rushing their auto flowers onto the market without generations of breeding (which takes a lot of time) and arriving at genetically 99.99% stable plants, they are kidding themselves, for if/when they do finally achieve the goal of 99.99% genetically stable plants, there will be too many growers with sour tastes in their mouths that will be forever wary of any future claims regarding the superiority of their "new and improved" autos, that their potential customer base will not buy even these "new and improved" plants, solely based on their previous experiences with the "first generation" autos. Instead, rather than being greedy and "jumping on the bandwagon" while the auto flower development was still in its infancy, they should have been prudent and held off selling these "first generation" auto flowering plants and instead have concentrated on offering the next generation of "new and improved" plants with much better genetic stability and that way would have captured a market share of loyal customers, which is the "bread and butter" of any business.
Fear of missing out on the sale of the latest trend in cannabis, auto flowering plants, has led to plants with sub standard genetics being released and without full genetic stability being achieved. While the breeders may be happy that they have had a slice of the auto flowering money pie in the short term, without a generation of "new and improved" plants with 99.99% genetic stability, they have "shot themselves in the foot", as when they do finally offer these "new and improved" plants, no one will buy them based on their previous experiences with the "first generation" auto flowering plants.
I know this is my view - for as they say - "once bitten, twice shy" !!
Hope this helps,.........
Organoman. (and sworn enemy of auto flowering plants!)