Thats autos for you, shes most likely in preflower. She is probably not showing due to LST, she is showing due to plant age.
When it decides its time to flower, it starts to flower, you could keep it on 18/6 until harvest but it wont stop it. If you have photoperiods in the tent with this one, they can stay on 18/6 and this plant will be fine.
In all likelihood, if your environment and nutrients are all on point, youre about to see explosive veg growth in the next 14-21 days, and more pistil formation as well.
Autos do best with minimal stress, lst, topping, heavy defoliation are all causing stress. Stress slows veg growth, and your plant will flower based on its own internal clock, whether youre ready or not.
Im liking dwc as a grow medium right now, it seems to have the veg speed that autos can really capitalize on. Im currently growing a photoperiod because I wanted to veg for 6-8 weeks, but by week 5 veg it was too big not to start 12/12, i would outgrow my space if I didnt
Sorry for the rant, hope it was helpful, good luck with the rest of your grow! ๐ช๐