The way you currently recruit her having sided with her, is already perfect as a means to recruit her having sided against her.
We will have to agree to disagree. I think not only is siding with her over the grove is both mechanically stupid and so narratively dissonant it basically is a meta-gaming route, but getting her so deep into Act 2 (I don't think you can even reach her without at least getting the Moonlantern/Pixie) removes any chance for her to have great incites on so many Act 1 events (and apparently many Act 2 ones as well, if I'm understanding things correctly). Her recruitment should be from Act 1.
