The 56-year-old has spoken out about her mental health issues in a recent interview, explaining how difficult she found the balance of work and family life after being asked to go on the BBC show.
Speaking to The Mirror, Fiona explained that during the 2005 series her mum was ill and needed a lot of care, and whilst balancing family life and dance training, the presenter was also getting up early to appear on GMTV.
She said, 'I was doing GMTV and had the children and my parents, and I threw that into the mix and I just felt this enormous guilt.'
Fiona revealed she would think to herself, '"Why am I doing this when my mum's in a home?" I was a mess...'
Fiona continued to explain that she had been struggling with depression already, which, combined with a busy family life, had caused her to turn down previous offers.
'I was asked to do the first series and the second. Then my agent said, "If you don't do it now you can say goodbye to big gigs at the BBC", and what have you. There was real pressure.
'So I did it but I wasn't well enough to be doing it, mentally.'
Despite her co-star at the time, Eamonn Holmes, urging her to talk to a medical professional, Fiona felt she couldn't. 'I didn't seek help – I didn't have time', she said.
This isn't the first time the mum-of-two has spoken out about her mental health, having previously penned an honest personal essay for The Mirror.
The essay detailed the struggles she faced on a daily basis, and challenged that more be done to support those with mental health issues.
'Some days I wake up with a horribly familiar feeling in my head. A fizz and a fuzz and a thumping weight,' the 56-year-old wrote in the piece. 'A tearful, heavy, lead-limbed unworthiness.
'Most times when that happens it's hard to face the day. Can't get up. Can't deal with the prospect of a dark day in bed. Get up. Go back. Get up. Have a shower in the hope it'll wash away.
'It's hard to describe. There's no tangible reason for it. It arrives at will. And does its worst.
'At times it's a self-loathing that brings with it a sense of shame – a perception of weakness, a not feeling able to say "I'm ill", because there's no physical outward manifestation of it. Apart from a shrunken demeanour.'