Just to add athing
Recently I was reading book by Sant Niranjan singhji ( Mystics Reflection...)
In the book he replied to the question of including women as punj pyare in amrit sanchaar as follows
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/sikh-sikhi-sikhism/1216-amrit-for-women-different-why.html
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/showthread.php?t=1216

The women has not availled their right to do so when Gurur Gobind ji asked for the five head so how can they now ask for same right .

Actually I was not satisfied with the answer what do you think about it Jarnail Singh ji