Definition

If its an auto, you probably stunted it's growth with the extreme defoliation. The more you remove the longer it will take to replenish the leaves you took from her. So instead of bud production, she has leaf production. Autos don't need defoliation. They are a timed plant and anything that stresses her will put her back that many more days for harvest.

I've used lst and trimming

What techniques have you used during her growth. What has the environment been. What settings does your light have, ie. veg, bloom etc. what nutrients are you using. You should start diary.... The growth is stunted so could be mistaken for an auto but autos are also victim to dodgy genetics and still need to be put into a 12/12 schedule to force flowering. So technically it is an auto. As you have burple lights if they have a bloom and veg switch, have them both switch on. I hope this helps, there are so many grower here willing to help so don't hesitate to ask....God luck and happy growing.