Most of the popular sources on the gender roles in the celtic society tend to be based on modern view on how it must have been. There are way too many mentions of high ranked women to suggest that there were any of male or female pulling rank. Even Caesar noticed this fact and experienced it first hand when the druid the Celts did send with the group to Rome to negotiate was a woman.

Just some examples which should make historians rethink their presumptions quite a few more times:

The problem isn't only for the Celts of course, but in most parts of the world - In Denmark they found a grave were the findings did indicate that the roles were switched. In Russia they found two graves where they first did think the man was buried with weapons and the woman with the child - only a long time afterwards when they actually did study the remains they discovered it was just the opposite. Just recently they found out that the Amazons the greek did write so much about actually did exist. And I'm sure it won't end there either.