In 2008, she was elected to Flintshire County Council as an independent representing Treuddyn before joining Labour in 2015.

[2][3][4] Whilst Deputy Leader, Thomas delivered a petition to the Senedd, calling for buses to be run 'for people, not profit'.

[6] In February 2022, Thomas was one of three Labour MSs to support introducing rent controls in Wales.

[8] Since being elected, Thomas has spoken of her experience of working as a postal worker in the Royal Mail following its privatisation in 2013.

She has called for Royal Mail to be returned to public ownership, saying that privatisation had 'wrecked' the business because of an 'unhinged profit-obsessed mantra'.