For the most part, if you are going to do a foliar spray, itβs best to do it just before your lights go out. Otherwise the water in the leaves acts like a magnifying glass and gives your leaves a sunburn. Itβs also not recommended to do on them once they begin flower as it could cause rot or mold issues in the bud.
As long as you are seeing growth with the new small, central leaves she should be ok.
I personally donβt like to spray my girls with anything. But itβs all a matter of preference.
As your plant grows, those leaves will eventually dry up from lack of light away- but unfortunately they will never go back to what they were before. π±