Here's why Lori's particular kind of human intelligence matters. Grammar books and dictionaries and AI programs only compare your prose to a few rules.
When Lori looks at your words she sees more. She sees an entire world. She sees the forest, the trees, the limbs, and the individual leaves. Of course, she looks for spelling goofs and grammar glitches amid all that.
But she does something more. She sees the words and the phrases and the sentences, and asks, Is this what you really mean to convey? She will ask it over and over again, until both of you are satisfied that the answer is yes.
Is that magic? Maybe. What's certain is that Lori's skill set as a human editor is unique and valuable, well worth your investment.