Some sort of deficiency?

bio nutrients as in BioTabs?? then yea they reuire a bit of breakdown. But like others stated I don't think this is P def Also don't think its N diff. https://420life.com/wp-content/uploads/2021/10/Marijuana-Leaf-Deficiency-Chart-scaled.jpg This chart can help

looks like pigmentation - fall colors through genetics or the temperatures at night are going lower than 68F, give or take. Just looks like a little 'fall' red to me. P-deficiency comes with a blue hue in the leaves as well as darker, copper-colored blotches.

doesn.t look like P def, more like N is there yellowing on bottom leaves ?

I suggest let her alone and she will show you if she needs something. She seems quite ok to me. Best of luck!

if you think right ( i dont see much lack ) than you allready have given her what she needs and you can just wait a few days. Dont try to give more. sometimes it is just while growing here faster than there that it looks very different from leaf to leaf