Research is great, random unrelated news stories not so much.
I am interested in research, I have no doubt that there are gender differences in sentencing, I don't think a single case should be taken as proof of that though.
I found this on the Home Office website: rds.homeoffice.gov.uk/rds/pdfs/hors170.pdf, a little dated, it does discuss gender role sentencing by examing 'typical' and 'atypical' female crimes.
For the 'typical' crime of shoplifting, women were several times less likely to be imprisoned, and almost twice as likely to be given a discharge, and for the 'atypical' crime, first-time male and female offenders were treated equally, but for recidivists women were far less likely to be imprisoned.
Contrary/more recent research would be of interest.