We have a placement guide on our site for Spelling Wisdom along with Using Language Well. You’ll need to scroll down the page to see it.
I also encourage you to download the samples for each Spelling Wisdom and look through the sample lessons. You’ll be looking for lessons where there are 3-4 words that are unfamiliar (cannot spell) to her. This tends to be what we call the “sweet spot” where they are allowed to focus on only a few words to study.