Family and friends contacted social services on several occasions from January 2020 and up until the month Star diedd_.
Alicia (half sister of Frankie Smith) says she contacted social services three months before the murder, as well as the police, after growing increasingly concerned for Star's welfare.
Alicia has shown Sky News an email she sent to the police, with images of Star's bruised face and testimony in text messages from another sister that she had seen Smith "slap her across the face".
According to Alicia, police never responded and her exchanges with social services were equally unsuccessful.
This is a transcript of the Snapchat conversation sent to police
SISTER: "I've just seen Frankie slap her across the face. X"
ALICIA: "OMG"
SISTER "I'm fuming x"
ALICIA: "Tell nana x"
SISTER: "K x"
ALICIA: "Something bad is going to happen. Why did she hit her?"
SISTER: "Coz she was playing with her shoe."
Around this time, police and social services took the child to hospital to be checked up, but accepted her injuries were accidental.
This was already the second time police had seen Star with bruising. Family and friends made a total of five referralss_, but Alicia now says she wishes she had taken things into her own hands.
"I was just angry, every day, because no one was listening to me," she said.
"I felt like all I could have done was taken her and run off with her."
Alicia gave evidence against her sister in court.
Although they were once best friends, she said: "I just can't ever speak to her again.
"I was literally screaming at Frankie, 'You don't have to be with that girl, we can call the police, we can get a restraining order.'
"I don't know if she didn't believe me, or she didn't want to."
I just feel angry because I think if that was me, if that was my child, I would have got away. I would have got out of that situation, no matter what.
"So, I can't forgive that."
One of the complaints to social services was dismissed as malicious despite bruises being found on tiny Star.
In January 2020, a friend of Smith raised concerns about Star to social services. The case was closed a month later.
In April 2020, Smith took Star back. Just a month later, Anita contacted social services who paid Smith a visit the same day.
Anita had contacted social services in May after she had been told that Brockhill had been 'slam-choking' Star - lifting by her neck and thrown on the bed - in order to 'toughen her up'.
Anita said that, after making the referral, she was not contacted by anyone from social services and was not told when the social services inquiry had been closed.
After she had made the referral, Anita said she David had their access to Star restricted and were only able to see her a couple more times before she died.
During the trial, disturbing details of the toddler's short life emerged, including a clip captured on CCTV of Brockhill repeatedly punching Star in the face and stomach over a three-hour period, nine days before the murder.
The toddler was also filmed being dragged through Bradford city centree_ by Smith and crawling painfully up the communal staircase to her mother's flat.
I have also read that Alicia was banned from seeing her niece by Frankie Smith.
Between February and April, Star was living with great grandparents Anita Smith and David Fawcett where she was content and happy.