The BBC is reporting that the Independent Office for Police Conduct (IOPC) has instructed the Met (MPS) to look into the aspect of an old complaint.
Caroline tragically took her own life in February 2020, aged 40.
A coroner made the ruling after learning prosecutors were going to press ahead with an assault charge related to an incident with boyfriend Lewis Burton.
Her mother, Christine Flack, told the BBC: “I just want those answers to make me feel better and to make me know that I’ve done the right thing by Caroline.”
The MPS spokesperson said: “Following a review, the IOPC agreed with the MPS that service was acceptable in relation to seven areas of the complaints relating to the response and handling of the incident by the MPS.
“The IOPC has directed the MPS to reinvestigate one element of the complaints. This relates to the process involved in appealing the CPS decision to caution Ms Flack.
“We will re-examine this element of the investigative process. Our thoughts and sympathies remain with Caroline’s family.”
Caroline’s devastated mum remains “sad and very angry” at the treatment of her daughter in the weeks before her death.
Tuesday will mark the second anniversary of the death of the popular Love Island host .
A coroner later ruled the former X Factor presenter was in turmoil because knew she was facing prosecution and feared the publicity the trial would attract.
Christine first complained to the Met one month after Caroline’s death.
She asked the force to investigate its duty of care towards her daughter and the procedures it followed when it arrested and subsequently charged her.
Speaking to BBC News, Caroline’s mum said she feels the decision to charge her daughter contributed to her death.
“She couldn’t see a way out,” Christine said.
She added she had now lost trust in the force:
“There’s no trust at all. No trust at all.”
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“I just want the truth out there,” she added. “And it won’t bring her back. I know it won’t bring it back. But I’ve got to do it for her.”
If you’re struggling and need to talk, the Samaritans operate a free helpline open 24/7 on 116 123. Alternatively, you can email firstname.lastname@example.org or visit their site to find your local branch.