What's really stupid is not being allowed to get on the flight at all.
Like: she's not labelled as a "terrorist", so just let her on the flight as she's not likely to make the plane explode, and let the customs folks take her as a one-off to be dealt with on home soil. Why is it necessary to be pre-approved to even get on the flight?
- a valid “immigration document” which satisfactorily establishes identity and nationality or citizenship.
- and, if the person requires a visa, a visa of the required kind or other permission to travel. This visa, or permission, may now be in either physical form, or a digital e- Visa; or
- a valid Electronic Travel Authorisation (ETA), if the person requires one.
https://www.gov.uk/government/publications/document-checks-a...