I think (in light of the revelations of the Separatists' plans) she would help unify the senate in support of the creation of the army, which is not the same as giving emergency powers. At the beginning of the movie, she was against the creation of an army, declaring that the right path was through negotiations. But what Obi-Wan's investigation revealed (and Padmé experienced this herself when debating with Dooku) was that the Separatists were not willing to negotiate. They were going to attack the Republic. So she was actually the person who could unify the senate in a pragmatic manner. Remember, the problem is that they needed to make a decision fast and they have no time to debate. Either the senate agrees unanimously about creating the army or they don't. As Bail points out, the senate would only do it after the Separatists attack, but by then a massacre would have happened. The alternative is to give emergency powers to someone else and that someone could make the decisions that needed to be made much faster and efficiently. That also happens to be the path to a dictatorship, which was Palpatine's plan all along.