Ms Portman's friends were pleading for anyone with information to come forward. Many have posted messages on a Facebook page set up to help the police investigation.
"Somebody knows! Speak up. Rae is a daughter and friend. Bring home Bok," Candice Nicholls wrote.
Another friend made an emotional appeal: "Imagine if this was your daughter, your sister or your friend. Just stop for one second and imagine how it feels ... her family and friends need to know, whatever it is."
Others were concerned that because of the time between the last sighting of Ms Portman and when she was reported missing, people may not remember important information.
"I'm angry that this wasn't acted on sooner by everyone ... now I fear the worst that I'll never see Rae again and that breaks my heart," a woman said.
CAN YOU HELP?
Contact police on 0800 723 767, Crimestoppers anonymously on 0800 555 111 or visit the Where is Rae (Bok) Portman Facebook page.