The Celebrity Big Brother star was among 18 mothers nominated in Foxy Bingo's public vote.
However, in the newly-unveiled shortlist, the mother-of-two - who had an eight-year affair with her brother-in-law Ryan Giggs - has failed to make the cut, taking into account thousands of public votes already cast.
Giggs had previously dismissed her nomination, telling Twitter followers: "Can u not see I was nominated to get u all talkin about it? And u fell 4 it #mugs (sic)"
Amanda Holden, Victoria Beckham, Katie Price and Holly Willoughby are among those still in the running. They are joined by MP Louise Mensch, Kym Marsh and Nicola McLean.
The top 10 is rounded off by The Only Way Is Essex star Chloe Sims, Danielle Lloyd and Prime Minister David Cameron's wife Samantha.
A competition insider told Digital Spy: "With a week to go, the voting is changing on a daily, sometimes hourly, basis.
"Some of the mums you would expect are right up there, like Amanda Holden, Holly Willoughby and Katie Price, but Chloe Sims's support on Twitter from people like Joey Essex has also given her a real chance too. At the moment it's too close to call."
Earlier this week, last year's winner Stacey Solomon was axed from the competition, after photographs of the pregnant singer were published in a Sunday newspaper.
The winner of 'Celebrity Mum of the Year' will be announced later this month, ahead of Mother's Day.
> Stacey Solomon on smoking row: 'I'm embarrassed and ashamed' - video