EastEnders fans watched her type in her father’s name into a search engine as she prepared to delve into her secret past.
However, could this storyline spark the return of Carol who could reveal some heartbreaking news if she discovered her daughter’s search.
Sonia has never shown much interest in tracking down her father so Carol may have held back the shocking truth about her parentage to spare her daughter’s feelings.
Could Sonia’s father be dead or perhaps Carol lied and her daughter’s father is someone else entirely?
EastEnders is available on BBC iPlayer.