She collected the Plato for the UK's special needs teacher of the year in a secondary school from Welsh singer Aled Jones, at a glamorous awards ceremony in London. She won the Welsh award in Cardiff last summer.
"It was wonderful, but quite nerve-racking," she said.
The special educational needs co-ordinator from Ysgol Gyfun Gymraeg Plasmawr, in Cardiff, started life as a technology teacher. She moved into special needs after her daughter suffered hearing problems as a child - and she realised there was no Welsh-speaker available to help her.
She is now one of the few teachers in the country able to communicate with hearing-impaired children in Welsh and English, but helps pupils with needs ranging from autism to dyslexia.
Headteacher Geraint Rees said: "We are all delighted for Meinir. She always acknowledges it takes an entire body of staff to deliver good special needs. She has inspired us to re-evaluate how we look at the whole issue of SEN."