You just twisted that from holding the male accountable to holding the female accountable. The fact is begum was groomed, trafficked, and abused. Part of the grooming process of course is to normalise the trafficking and abuse to gain her consent.
Unless there is stuff the security services/ home secretary are privy to that the public is not, then she's simply being made an example of and what we are doing is wrong.
Any arguments I've heard to keep her out of the UK so far seem to be based on fear, hatred and low level Islamophbia. All strong emotions but not a justification morally or legally.