E-Elphie?

So, there's a fanfic idea I've been thinking about where, post-Wicked, Glinda has given up her Good Witch of the North persona, and has taken up modest philanthropies instead.  While helping out in an Animal caravan, Glinda hears a voice she hasn't heard in years, and goes in search.  Upon entering a tent, she sees a with her head covered.

When the woman sees Glinda, she pulls down the scarf from her face, revealing Glinda's old friend, Elphaba.