It was in the seedling mix to long , have a look at the grow diary and you will see it's been hungry for a while. That coupled with transplant shock is your issue.
You can not wash nutrients out unless stated by 420sa you out huge amounts of water .
2ml per L biobizz with a 25% runoff to start , folior feed with Epsom at 1g per L and give her time to root properly and she will recover nicely .
Good advice given by 420sa on aact and the microbes .
Sorry it cant be a longer answere , busy day