Was topped only once, and spread horizontally.
Has had since very early on some kind of issue with its leaf Colouration but still grown side by side with her sister in the same soil, feed and conditions.
I believe you need Cal-Mag. Use at 75% strength with each watering for a week. I think you’ll see difference. This will unlock your nitrogen usage and she should green up. I myself wouldn’t add more nitrogen until cal-Mag treatment. I use it in all my H2O at 50% throughout total grow. I feel it helps me use about 50% less ferts.