Connie Yates said support from the Pope and US President Donald Trump, as well as medics in America and the Vatican, had given the 11-month-old more time after his life-support had been due to be switched off on Friday.
His parents want to take him for experimental therapy in the US but lost a lengthy legal battle after judges ruled in favour of doctors at Great Ormond Street Hospital, where Charlie is being treated.
Ms Yates said seeing him stricken in hospital and wondering when his last moment would be was "absolute living hell".
She told Good Morning Britain: "He's our own flesh and blood and we don't even have a say in his life whatsoever.
"We are not bad parents, we are there for him all the time, we are completely devoted to him and he's not in pain and suffering, and I promise everyone I would not sit there and watch my son in pain and suffering, I couldn't do it."