Thanks for the question! Take a look at the first words of Maria’s argument, “but you forget…” and then she produces new evidence that Pedro doesn’t mention earlier. In other words, she thinks that Pedro’s conclusion is hasty, based on inadequate evidence about cloth diapers, since he doesn’t consider the fact that cloth diapers must be washed in hot water, which requires energy. This means that Pedro has an incomplete understanding of cloth diapers, or bases his claims on inadequate evidence surrounding them.
Hope this helps! Feel free to ask any other questions that you might have.