Christina, Sabrina's sister, reads a tribute on behalf of the nursery teacher's partner. She says he "is completely heartbroken" - and goes on to say "Sabrina was loved by everyone, but for me and my son it was beyond love and words."
Sabrina Moss was fatally shot in Kilburn on Saturday. She'd been celebrating her Birthday with a friend, who was also injured in the attack.
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The prime minister was shouted at as she left the scene of the tragedy in which at least 79 people died.
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The inaugural service left London Liverpool Street for Shenfield, Essex, on the existing TfL Rail route on Thursday morning.