A short theory to begin with and credit to whoever thought of this.
The date in the title is the date the doctor and Rose met.
But it's also the date on Clara's mothers gravestone:
So it's possible to assume that she could have died in the auton/mannequin attacks that happened on that day.
Comment your thoughts about this theory.
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Doctor Who Theories
FanfictionTheories about the BBC show Doctor Who. I own none of these theories unless stated otherwise, I'll try to answer questions about them to the best of my knowledge.