Crack theory – DQ’s mirror had the power to reveal her true love, and it revealed Zelena, along with a future full of happiness and kids, that they were meant to have together. When she found out about Zelena’s death she used the mirror to watch what should have been her future until she was driven insane (like the mirror of Erised), which is why she’s only just come out of the woodwork now.
She smashed the mirror in a rage one night, but in her desperate panic to fix it again she discovered a spell to combine different, powerful mirrors, that would enable her to reach into the past and save Zelena, thus saving her own future too.
The mirror showed her what was meant to happen, had everything gone to plan. But then Rumple went and butchered Zelena so… oh well :/
"so there’s this new show….."
"there’s lesbians in it"