Amsterdam

I personally dont like any budgies who have been inbred for human satisfaction

She is preparing and inspecting the nest but you have 6 budgies in 1 cage with 3 nest boxes? that is asking for problems i woudnt recommend that at all.

Keep them seperated this is aggresive behaviour and please dont take any risk because the aftermath can be fatal.

Seperate them ASAP and let the male take care of the young ones.