HOUSTON -- New images show missing 4-year-old Maleah Davis smiling after brain surgery, just weeks before she vanished.
Maleah's mother shared video of her daughter with KTRK-TV.
The video shows nurses wheeling Maleah to her hospital room after undergoing surgery in March.
She cracks a smile while holding a rainbow balloon, and the room erupts in cheers.
Maleah vanished in early May.
Her mother's former fiancé, Derion Vence, has been charged with evidence tampering in the case.
A total of $20,000 in rewards have been offered for information leading police to her location or a conviction in the case.
Bittersweet video shows Maleah Davis smiling before disappearance
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