Complete bullshit, good find from you! In autumn 2012 she moved from her executive flat to a two-bed (going from 725£ to 675 in rent). She was financially secure enough at this point to take on two cats.
She then started a home craft business, had some photos locally exhibited, and got a job at the Southend Echo. AFAIK that job was as a trainee reporter. The only way her story makes sense is if she was, indeed, hired as the paper's official prostitute, which would be quite the scandal.
She signed her first book deal in May 2013.
ETA: in the anonymous Buzzfeed piece about domestic violence in same sex relationships, she specifically claimed to have worked as a prostitute prior to her pregnancy. Admittedly details could have been changed to preserve anonymity etc, but a key part of that story was that the abusive girlfriend was abusive while Jack was pregnant and bullied her for having worked as a prostitute.