Deficiency because she starts to flower? Leaf tipps light green. Some purple at the stems.

Hey my plants have the same symptoms, but I know my soil is super hot, so it's definitely not deficiency. In my experience, this happens during rapid growth especially during preflower stretch especially in Autos! I think that the growth out paces the nutrient flow and so as long as older leaves are fine with very little to no yellow tips,then you are doing great so far!! Happy Growing!!!

Not a deficiency, but a slight over dosing of nitrogen.

I wold hold course. Your plant isn't pale or anything. Your new growth appears to be darkening up as it gets older. Once those flowers really start springing up you'll probably be ready for the P-K.