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Dani told Radio Times: "I got so many messages, people telling me that I'm fat, that I'm overweight and I was like a size six at the time.
"So I was like, 'Holy moly, if I'm fat, God knows what other people must be thinking if they're bigger than me', that must be just horrible.
"I can think of things really logically and be like, obviously, I'm not fat, that's ridiculous.
"This person, obviously, is just bored, or has something wrong with their life that they feel like this is the only way they can get some validation and I actually feel sorry for them," she added.
Dani also said that people are beginning to be more open about their mental health struggles on social media.
She said: ""I think we're a bit more open about our mental health states now.
"People are being a bit more honest on their social media pages and using them a bit more responsibly.
"So hopefully we're coming out the other side of it now."
Dani and former Strictly professional Vincent Simone finished in fourth place.
In related news, Dani is returning as Tracy Beaker this month for a brand new series called My Mum Tracy Beaker.
The new instalment follows Tracy and her 10-year-old daughter Jess (Emma Maggie Davies), as they try to scrape by financially but with a close and loving bond that Tracy missed out on with her own mum.
The three-episode adaption is based on Jacqueline Wilson's book of the same name. The series also explores how their lives change drastically with the arrival of Tracy's rich new boyfriend, Sean Godfrey (Jordan Duvigneau).
My Mum Tracy Beaker premieres on CBBC and BBC iPlayer on 12th February.
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