Anyone here see Lord of the Rings? I say this cuz I think we'll see "Willow the White" in the finale.
The white hair and euphoric expression (in the preview) was a big tip-off for me, and leads me to feel that she will come to accept a pure/white form of witchy power. Hopefully this will turn the tide against The First.
As to the whole healing thread, I believe Willow would've tried to heal Xander. His eye was completely gone, though, so it may have only healed the empty socket (but hey... they don't call it "MAGIC" for nothing!😉). It would have been a great moment in the hospital if Will had offered to try with the healing, and Xander would refuse her help in order to protect her.
While I'm at it, props to Nicholas Brendon for what's the most convincing horrific scream of the series during his encounter with Caleb... I get chills each time they've shown the eye-gouging on "Previously on Buffy"!