The Third Man (Carol Reed 1949)

About 8-10 minutes into the film, an actress (I think uncredited) appears on the arm of Crabbin (Wilfred Hyde-White) as they leave a restaurant and meet Holly Martins (Joseph Cotton). She appears later in the film albeit briefly and again without lines. I recognise her even though the film is as old as myself! It’s as though her daughter or granddaughter is relatively more famous. I photographed her from a screen still but I just can’t think of who she reminds me of. Anyone know who she was? My own theory is that she’s related to somebody in the Production Team…..as an uncredited extra?