Hilfe, was fehlt ihr ?

You can carefully move it to a bigger pot without damaging the roots! Or you give it some more medium in the current pot. And maybe give it some air holes the pot! So the massive root system get the air it needs inside of that little pot

Don’t feed her much calmag! Maybe 0,5ml per L of water. I don’t think she needs more actually

If your medium is coco, don’t forget to feed her everyday! You don’t want the medium to dry out

She looks thirsty and rootbound. When you water you should add some silica. It's good for most of the growth for certain things but it might help with reducing stress and it will help develop some frost on the buds. Some kelp will help her out too. If my plants are really stressed, sometimes I will add pure protein (fish hydrolysate) to a watering mostly in veg because it is high in N . It absorbs better as a foliar feed but I just use it as a root feed. i will only use it on the roots up until early -mid-flower like you are. You should give her some cal-mag and even a touch of rock dust if you have it.