Signs of flowering?

It is starting to flower, It might still stretch a bit but not a whole lot. Autos can be stressed into early flower by a lot of factors like over fertilization or HST, They seem to be more prone to reactions to the root zone aka no transplants. They can also do this all on their own and sometimes veg for 7 weeks before going into flower and at that point it would be better to just grow a photoperiod. One note on transplants some can do it so gently that they do not react, It just easier to not do it and avoid any potentinal messup. Maybe try photoperiods next or a different strain of auto that can take a bit more abuse. I had descent sized plants with FastBuds mexcian airlines outdoors one year. I even accidentally topped it once and it worked out well. I was not a fan of the buds profile, taste, high, looks, but i am picky and do not like crazy high THC strains. Other I gave it to did like it. to each their own. Good Luck!