What you have is another one of those situations that I think God lets happen just so he can see the discussions on these forums!
As I understand it, the GIRM does say “men” and that is the way it has traditionally been done. It is a stark and beautiful reminder of how much God loves us (our King washes
our feet) and the call to service of his often unappreciated priests.
Some places in recent years have started including women, especially up in the Boston Archdiocese. When Cardinal O’Malley took over, he went back to all men and was lambasted for it. The Cardinal did what I think is the right thing: He asked the Vatician, specifically the Congregation for Divine Worship and the Discipline of the Sacraments (CDW) if women could be admitted to the ceremony and was told that as the archbishop he could make a pastoral decision to admit women to the footwashing ritual on Holy Thursday. See here:
rcab.org/Pilot/2005/ps050401/holythursday.html
At that point you are dead in the water, since the CDW reply did not limit this to just Boston, so it applies to every archbishop everywhere.
Personally, while I dearly love my sisters in Christ, this is one area where we have to say a repsectful “no”. Scripture does not say Jesus washed the feet of all present, it says “his disciples” and more importantly, it tells us what Jesus told them (the disciples, not everyone) the meaning of what this ritual was. Sorry for the mini-rant there, this just seems to be sooooo clear, I can’t believe we are discussing it, much less doing it.
Have a Blessed Easter.