You seem to miss the point entirely here Swale

I believe the government believes that it has dealt with it by perfectly legally stripping citizenship from a dual national and not leaving her stateless (albeit there is some uncertainty about the Bangladeshi nationality - lets face it everyone wants to distance themselves from this woman). It has thus "fulfilled its obligation under international law" and has no further responsibility. She is appealing that stripping, and wanted to enter this country to manage her appeal. This is what she has lost this case on.

So she will then have to win the appeal and regain British citizenship.

If she does that, then the points you raise has validity because she becomes our responsibility again. But until then, she doesn't. There is no "innocent until proved otherwise" about it, its simply a civil court matter based on fact and law. I dont know enough about the detail to comment on how said appeal might go and a lot of the evidence given to the recent case has been redacted so we will not know for many years to come