Linda,
In my opinion, I think that your daughter would still benefit from using Rod and Staff English 7; because it integrates writing and a whole host of other English skills within the program. This will provide a different feel from what she's already had in the past.
As far as using Rod and Staff English, I'll share that at our house my oldest son (who just graduated in May) preferred to do his lessons orally with us rather than write out all of the answers. However, due to time constraints for his senior year, he did do the last half of English 8 just the way you are describing in your post. He did the lessons and checked them himself using the Teacher's Guide key. He did share that it was more difficult, and less interesting, to do Rod and Staff English this way. However, it did work for him for that season.
With my next son in line, who is a sophomore this year, we do still go over his lessons regularly. However, he does enjoy writing out the answers ahead of time to save time during the meeting with us later. Sometimes he has the whole lesson done before he ever gets to meet with us. To me, this is fine as well. We just orally do whatever he has left. With my younger kiddos, we definitely meet each time with them and do 2/3 of the English lesson orally and 1/3 on paper.
So, with your older daughter you can decide how best to approach Rod and Staff English to best fit your needs and hers. It may be a changing approach from year to year, depending on what your schedule allows. I do feel that kiddos benefit from some oral discussion and application of the English lessons, simply because English is a spoken as well as a written language!
Blessings,
Carrie