What is that

1 drop of nutrients on a leaf will become like 10-100 times stronger before it completely evaporate! This will in turn leave whatever the leaf cannot absorb as a dry residue that will damage or even dissolve the leaf-tissue, leading to discoloration, scars or even holes.

Looks to me like you sprayed her with lights on too strong. Some drops akt like a magnifying Glas an burn the leave. Always use destilled water and turn the lights down or hang them higher. Happy growing 🤞

Just burns.