From SFE:
When you’re eligible for full support
You can apply for full support if all the following apply:
you’re a UK national or Irish citizen or have ‘settled status’ (no restrictions on how long you can stay)
you normally live in England
you’ve been living legally in the UK, the Channel Islands or the Isle of Man for 3 continuous years before the first day of your course, apart from temporary absences such as going on holiday
You may be eligible for full support if you’re a UK national (or family member of a UK national) who both:
was living in the EU, Switzerland, Norway, Iceland or Liechtenstein on 31 December 2021, or returned to the UK by 31 December 2020 after living in the EU, Switzerland, Norway, Iceland or Liechtenstein
has been living in the UK, the EU, Gibraltar, Switzerland, Norway, Iceland or Liechtenstein for the past 3 years
So she is not automatically eligible and you’ll need to contact SFE to explain her exact situation and they can advice.
Just to clarify a PP’s point, how universities view you and how student finance view you are two totally separate things. Universities will assess if you are home or international and offer the appropriate fee level. Separate to that SFE assesses your eligibility for support. So you can be classed as a home student but not eligible for SFE and vice versa. Definitely speak to SFE direct to clarify.