Whilst at LSE she worked as a stringer for national newspapers and after graduating she became indentured as a trainee reporter on the Wimbledon News.
In the summer of 1992, Marshall, together with Channel 4 News' Ian Williams, were the first television journalists to uncover the Serb-run detention camps in Bosnia.
The false accusations were reprinted in the British LM magazine (formerly Living Marxism) in an article by Thomas Deichmann and ITN sued.
[3] An examination of the case by a professor of cultural and political geography at Durham University argued that the key claims made by the magazine were "erroneous and flawed".
[citation needed] She is a regular volunteer at a Pupil Referral Unit for children excluded from mainstream school in West London and is now a Founding Trustee of a charity to help raise funds and awareness to support them.