I forgot to mention that she is from an EU country.
I have been investing this and I have now an idea on how to proceed and get a more precise information.
I think she probably can then if she's fine to get a European health insurance card - you could perhaps check with the hospital she'd be referred to and/or citizens advice.
https://europa.eu/youreurope/citizens/residence/residence-rights/pensioners/index_en.htm
As an EU national, you can live in any EU country if you have:
Income could come from a pension, if you are a pensioner, or any other source of revenue.
- comprehensive health insurance cover in your host country
- sufficient income to live there without needing income support.