hi and welcome
oh dear oh dear…this is the behaviourists nightmare…2 girlies battling for status with little direction and proper re-enforcement
this is a really complex pack issue…you have introduced competition…they were getting on well until the boys became part of the pack….
they have been spayed ….so the calming hormones have been taken away and if i understand you correctly then one boy has been done but not the other??
until you get help from a prof behaviourist that should do a full assessment before advising anything then you must keep them totally apart and out of sight of each other…musical dogs stage i am afraid…one in one out etc….this has been building and has now reached a serious peak…this is the worse scenario…girls in this state …with this build up will fight to the death….especially if the pack managers role has not been re-enforced correctly….
i am happy to come and assess the situation if you wish but in realty i doubt if very much can be done now and that you should consider re-homing one of them…
sorry but as i said this is as bad as it gets