The rest of her family appear to be in Brecon in 1881 - as per Ancestry transcription
William Dowdaswell 31 - loco driver b St Mary's , Gloucestershire
Margaret Dowdaswell 30 b Merthyr Cynog, Brecon
William David Dowdaswell 8 b Dowlais, Glam
Albert Raca [Rees] Dowdaswell 6 b St Mary's , Gloucestershire
Frederick Dowdaswell 1 St Mary's , Herefordshire
RG11/ 5459/ 39/ 6
She appears to be with parents in 1891