She is though to have been travelling by train from Reading to the Croydon area and police believe she may have met this man at the town's main station.
Sasha is 5ft 6ins, medium build and has shoulder length dark hair.
Det Con Nicola Slater from Reading police station said: “We are increasingly concerned for Sasha’s welfare as it has been a few days since she was last seen.
“After looking at CCTV images, we would like to speak to this man as we believe he may have information about her whereabouts.
“If you recognise him, or Sasha, then please contact us immediately as we just want to ensure her safety.
“And Sasha, if you see this, please call us or let a family member or friend know where you are. You’re not in any trouble, we just want to make sure you’re safe.”
Anyone with information is asked to call police on 101.
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