"I should hope now she will get plenty of support - a social worker as she will be a vulnerable adult, sheltered accommodation possibly, and hopefully psychological support."
I wouldn't count on it, TBH. Since the ratification of the European Council on Trafficking, she will be entitled to leave to remain in the UK for one year as a "reflection period" but after that she, like the vast majority of victims of trafficking in the UK will have to make a claim for asylum or protection under the Human Rights Act. If she has family in Pakistan, it is likely that the Border Agency will expect her to return to them.