On figuring out characters: What's Wig-Girl doing here?!

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My husband and I have been at the beach for a week. Every morning I have been reading and editing the first draft of The Next Novel. Some days I was pleased, other days the verdict was more "Hummm." The last pages, which I read yesterday, made me shed a few tears (always a good sign). All in all, I think it's a good first draft, and I'm ready to roll up my sleeves and dig in.

There is one character (Wig-Girl) who puzzles me, an invented character I haven't figured out yet. (Most of the othe...