The mum-of-five wanted to come on the show after the death of Keith Chegwin, who she said contacted her to offer his help as he was suffering from the same terminal lung condition as her mum Amy.
Speaking on the panel, she said: 'I don't want my mum to die... How can my mum die, it could be my last Christmas with her.
Katie came on the show to discuss her mum's condition following Keith Chegwin's death
'My mum had a cough for five years, they thought it was asthma, then a few months ago she had a cold.
'She works out all the time. I hadn't seen her for a few weeks and I told I couldn't see her because she's going to die. I told her: "I won't see you grow old, you won't see Harvey's 18th birthday".'
But speaking about it proved too much for the reality TV star, who broke down in tears and had to be led off by Ruth Langsford, who later explained why Katie wanted to come on the show to discuss the condition.
'She wanted to come on today and talk about Keith's condition and raise awareness… Unfortunately as you saw she couldn't cope talking about her mum so she's gone off and we've got her a cup of tea and we are going to continue the show without her,' she said.
The mum had to be leave the panel after breaking down in tears
Her emotional account stroke a chord with many viewers who took to social media to comment on her appearance on the show.
One said: 'In absolute tears 😢 really feel for her', while another wrote: 'She broke my heart watching her cry. Katie never apologise for how you feel ☹️'.
A third tweeted: 'To go through what Katie and her family are going through is one of the hardest things ! One minute you feel fine next you're not ! I've been there ! Sending ❤️'
Katie revealed in September that her mum had been diagnosed with a terminal lung condition, for which there is no known cure.