Dark
Contrary to popular belief, Glinda liked the dark. It was peaceful to be alone in the dark sometimes, and as a public figure, she cherished those moments.
It was when it was dark outside that she sat and thought about thing she couldn't say out loud.
Glinda thought of Elphaba… and what she would do if she found her.
She'd run up to Elphaba and hug her, asking where she had gone, how she was doing, if she wanted to see her again.
And in her mind, Elphaba would answer, but the words she wasn't sure of.
Lady Glinda loved the dark.