What the source says
María Luz Martínez Seijo appears in the 2023 elected-members workbook.
The source associates this elected result with Palencia and the candidature label PARTIDO SOCIALISTA OBRERO ESPAÑOL (PSOE).
María Luz Martínez Seijo is named as elected for Palencia in Spain's official 2023 Congress elected-result workbook under PSOE. This is a historical result record, not a current-tenure claim.
The source associates this elected result with Palencia and the candidature label PARTIDO SOCIALISTA OBRERO ESPAÑOL (PSOE).