"I just want to say to any kids out there watching, while it is hard raising a lot of you, raising my children was the happiest years of my life, and I raised mine a single mum," said the mother-of-two.
"It was really bloody hard but I never regretted it and I don't want children watching this thinking they aren't bringing joy."
Gretel's emotional outburst followed a segment where a woman described motherhood as feeling trapped.
"I do not resent my child, but I resent that having a child did essentially trap me," the woman said.
"I'm stuck in a house in the suburbs - I've never experienced what it's like to be free."
The 52-year-old responded by explaining that she went through the same thing.
"I know the battles, I fought them. But it was worth it," Gretel said.
"While I support all women - and there are various organisations if you're finding it very tough as a mum - while I support all of that, we have to be careful also we're not romanticising what we don't have.
"Many girls don't have children who yearn to have them."