I've just read an article from 2008 and it mentions that Emma and Sophie lived together when they were younger (which we know).

I lived with Sophie Anderton when I was in London. What was it like? Well, as my fiancé says, "If you can't say something nice about someone, don't say anything at all."

http://www.dailymail.co.uk/home/mosl...ton-naked.html

Does anyone know anything else about this?

I don't know that anyone knows a lot of details. It was mentioned by Emma in passing at the time.

Some people thought she was a bit harsh in her interview of Sophie (can't remember it myself) and were linking the two.
Emma a bit mean to Sophie
Who did Emma say she shared a flat with?

Sophie was a truly disturbed person.