It's really important that they learn that there are different text 'types' such as narratives, information reports, expositions, discussions, recounts and explanations. Its about teaching them that different types of texts have different purposes and we use them for different things. Overall, it helps them with their comprehension of what they read. I don't think what your child's school is doing is inappropriate and like with anything, some kids will take longer than others to fully understand the concept and context of each one, and each year it's built on progressively so they might learn how to do a very basic exposition in year 2, but the next year they will need more detail etc. it sounds like what your DD has done is fine (even with your help) because she's still learning the basic fundamentals of that particular text type. I know my school does a scope and sequence outlining which text type will be focused on each term, so for one term they will do narratives and the majority of their work will focus on this text type. Next term it might be information reports. We scaffold the students and support them and provide highly detailed lessons that explain it so they understand it, as well as giving them a lot of guidance and support while writing.