I wonder what is Brewer's rationale for this.
It could be that she supports it in principle, but she thinks that, as governor of Arizona, she has no authority over bills pertaining to the President.
Perhaps she realized that requiring for documents that some states do not even provide is absolutely bats*** crazy?? Or perhaps as she pointed out asking for baptismal or circumcision certificates was a bit much??
Or it could be she is absolutely bats*** nuts and supported that craziness but didn't want her state turned into an even larger laughing stock than it already is and for it to get drop kicked out of court.