Schofield opened up to the BBC after a turbulent couple of weeks which saw him admitting to having an “unwise but not illegal” affair with a much younger ITV staff member and exiting the daytime programme.
Katona posted a clip on Instagram in which Schofield says: "My girls saved my life. They haven't left me for a moment. They've been by my side every moment because they are scared to let me out of their sight. And if my girls had not been there I wouldn't be here."
The former Atomic Kitten star said it was "exactly how I felt" after her interview with Schofield 15 years ago, in which medication she was taking for bipolar disorder caused her to slur her words, sparking claims she was intoxicated.
"If I didn’t have my children I’d have killed myself #fact!" she wrote.
"Things need to change drastically at ITV!! Nobody reach out to me after the interview or asked me what bipolar was, or what medication I was on!"
She went on to note how there have been suicides among former Love Islanders, and also referred to the dating show's former host, Flack.
"To EVERYONE who is involved with this I really hope that they are ALL getting the right support!!!" she added of the This Morning controversy.
Katona said earlier this week that she believes the daytime show “needs to go”.
Recalling her interview on GB News, she said it had a long-lasting impact and called the programme “fake, phoney and false".
Two years ago the singer said there was no bad blood between her and Schofield.
"I mean I get on great with Phillip now, and he’s been absolutely lovely,” she said on the Marnie’s Home Truths podcast.
Yahoo has contacted ITV for comment.
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Watch: What have we learned from the Phillip Schofield interviews?