Choochoothepand: you might find it useful to read Baroness Corston's 2007 report on women in prison:
<a class="break-all" href="http://webarchive.nationalarchives.gov.uk/20130206102659/www.justice.gov.uk/publications/docs/corston-report-march-2007.pdf" rel="nofollow" target="_blank">webarchive.nationalarchives.gov.uk/20130206102659/www.justice.gov.uk/publications/docs/corston-report-march-2007.pdf
It's quite long (110 pages) but if you haven't got time, here's a particularly relevant paragraph from the foreword:
"There are many women in prison, either on remand or serving sentences for minor, non-violent offences, for whom prison is both disproportionate and inappropriate. Many of them suffer poor
physical and mental health or substance abuse, or both. Large numbers have endured violent or sexual abuse or had chaotic childhoods. Many have been in care. I have concluded that we are
rightly exercised about paedophiles, but seem to have little sympathy, understanding or interest in those who have been their victims, many of whom end up in prison. The tragic series of murders in Suffolk during December 2006 rightly focussed public attention on these women as women first and foremost - someone’s daughter, mother, girlfriend, then as victims – exploited by men, damaged by abuse and drug addiction. These are among the women whom society must support and help to establish themselves in the community."
Corston spent a good deal of time carrying out the research for her report. We can trust her conclusions.