Ah, it's frustrating for Mom and daughter to need to return and review, isn't it? [I'm not even fond of reviewing when I forget directions myself!]
Does your daughter have difficulty with retention in other subjects as well? How about in math? The reason I ask is that math generally involves daily review, so concepts are not forgotten as easily. If your daughter retains math problems better, that might give us a starting point.
My suggestions would be these: First, every day, have her read the introductory explanations for the day's lesson aloud, as you listen. As she reads the examples, ask questions to determine if she does understand. Then have her do just the first 'problem' on the page. If she understands, allow her to continue with the lesson. Correct her assignment that day and, if it appears that she has had difficulty, review the topic right then. Be sure to praise her for her efforts.
The next day, spend a few minutes reviewing with her the lesson from the previous day, before progressing to the new lesson. This time of review can really help cement in the concepts.
Finally, math concepts often stick better when they are coupled with hands on examples. Language lessons, too, can be made hands on, by opening a favorite book [it's easier to do this with primary books], showing your daughter how to find the parts of speech or subjects, etc. Then ask her to find a few subjects, or nouns or whatever the topic is. If she continues to seem to need a little extra review, assigning her to find five nouns or subjects, etc., every afternoon can be a low-key way to practice.
May God bless and guide your homeschool years!