My usual offspec is Moonkin, but I haven't ever specced it until level 80. Leveling is usually a whole different ballgame than what is the best dps rotation on a boss that's standing there hitting a tank.
The Moonkin Repository is a good board for Moonkins that should have more relevant information than EJ, but it still may be tough to come up with leveling-specific information. edit: This link is to their Leveling subforum, but it's pretty sparse on information.
This is especially true if she will be leveling with you. :p It's different from solo, which is different still from queuing up in the dungeon finder.
The only general suggestions I can say is that so long as she's not questing in places a few levels higher than her, she can probably avoid Hit altogether. Moonkin are one of the best specs when it comes to hit, getting 7% through talents, which is already going to cap you for equal level mobs. Spell Power, Haste, and Crit are all good. SP is generally king. Haste vs Crit is weird, though -- it's pretty well mathed out for raids, but speaking from experience, Moonkin have huge mana troubles outside of raids due to how our mana regen works. More crit will help with that, but I suppose drinking every so often (and Innervate every 3 minutes!) works fine, too. Dreamstate may be a worthwhile talent for leveling Moonkin, but I don't really know. Just be aware that when you see talent specs online they almost always mean either raiding or PVP... and in the Moonkin's case, probably only raiding cause PVP as a Moonkin is painful. :p And Typhooning fellows off the Lumber Mill is harder than it looks!
Levels 50, 51, and 52 get her points in the Eclipse talent which changes how Moonkins work kinda dramatically. It's good stuffs, though.
