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Her heart's breaking.
Why'd she ever tell Henry she adopted him? Now he's brought this blonde here, and Regina's convinced the woman's out to destroy everything. There's just no other explanation for what's been happening.
She's noticed the changes. She's watched the clock in town square, noticed how it's moving, signifying that things are changing.
And that's not the only thing that's changed. The days aren't exactly the same, so predictable she could write a script like their lives are one of the movies of this world. It signifies changes, that her curse is crumbling.
She has to do something.