You will want to be careful when adding length to this dress because of the location of the pockets. You will want to assess for your daughter, where more of her length is. If more of her height is in the upper torso, and her arms match ;), than I would look at lengthening at about waist height. If, however, her length falls more into the legs, I would be more inclined to put the length at the hem line, or if it’s a lot of length, I would split it between the waist and hem.
As to the width, I think I would cut out the size 5 and just use a larger seam allowance. You have several areas where you can take in the fullness because of all the style lines or seam lines. Since you are wanting to do this quickly, I am assuming that tracing off the size 5 would be quicker than trying to grade down a size. This will also give you the length from shoulder to chest for her upper body length.
Since you do not want to do s muslin, I would quite possibly look at basting or pinning the seam lines (this depends on your daughter and her ability to stand and try on garments) to see what you will be getting for a fit. That way you can determine how much to take in on your seams.
I hope that helps get your started. Looking forward to seeing your project. 🙂
Carol