Dahaba Ali Hussen, who came to the UK aged 10, was told her application "did not meet the requirements" of the post-Brexit settlement scheme.
But Conservative elections guru Lord Hayward tells HuffPost UK Boris Johnson should not try to exploit the issue.
An international tug of war has broken out over doses of the AstraZeneca vaccine.
“It is the second time in the space of six months that the UK government is set to breach international law."
The PM made fish a central focus of Brexit talks and promised to "take back control" of UK waters – but it's not going to plan.
It follows the decision by some European countries – including Germany and France – to advise against its use for older age groups.
The bloc drew widespread condemnation for its plan to override part of the Brexit deal as part of its export controls on coronavirus vaccines.
The European Union performed an embarrassing U-turn after widespread condemnation of its move to control vaccines.
Embarrassment as European Commission says Article 16 is "unaffected" after widespread condemnation.