But the determined mum's tireless campaigning to get to the truth took a step closer after the Independent Office of Police Conduct urged the Met to reopen its investigation into the case against the tragic TV star.
The watchdog has recommended the force's Directorate of Professional Standards interview an officer who was at Caroline's 2019 arrest, shortly before she killed herself.
He was said to have been involved in the move to overrule the CPS decision to only issue the Love Island host with a caution for attacking Lewis Burton.
But the unnamed officer was not compelled to give evidence for initial reviews into police conduct as he had left the force. He has since returned to duty.
Christine was told last month about the development.
She said last night: "We won't stop until we get the truth."
The Met last year apologised to Caroline's family after admitting officers did not record why they appealed against the CPS caution.
Christine added: "Something very unusual happened to Carrie at the police station that night, but no one kept a proper record explaining why.
"I have now made a complaint to compel the officer to give the statement we think he should have given four years ago. As a family, we have been left with important unanswered questions."
Christine also revealed she has been urging Met Commissioner Mark Rowley for a meeting, but has been unsuccessful. She said: "He has refused to speak to me. Now it's time the Met gave us full disclosure." The unnamed officer's missing account of events is understood to be viewed as an "outstanding line of enquiry".
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