Thank you both for your response. Sounds like she might be eligible is there isn't any stipulation for her to have lived in the UK.
Thanks again.

Hoping someone can help me please. Both myself (33 yrs old) and my brother (36 yrs old) live in the UK on UK passports, I have been here for 8 years and my brother 2 years. Our father was born in the UK (although has since moved to Australia). My mother is 67 years old and wanting to travel to the ...