Not positive but could be a few things.. if your pH is on point, It appears to an immobile nutrient which show on new growth first.
Immobile nutrients are the trace minerals that are usually in the âmicroâ nutrient bottle.. they are the ones that are in small percentages compared to the main NPKs.
I noticed youâre lower growth is yellowing and it wasnât the week before. Maybe she just needs a good overall feed.