I wouldnt risk stressing your plant out and possibly stunting its growth or even worse turning hermie . If its an auto it will flower regardless of the time the lights are on and off i mean dont go lower then 12 hours a day cause then its not long enough , but I would just leave it on 12-12 and she will keep growing when she's ready she will just start flowering ! I hope this information helps you to understand what the risks are if you play around with the lights too much . Over all your in great shape keep up the great work ! - Happy Growing!