Chenneour had been meeting her ex-boyfriend at Joe & The Juice on Kensington High Street when her phone was taken from a table.
A confrontation quickly escalated into what she described as a "full-on fight between four people for about five minutes".
Chenneour said she "very quickly asked for my phone back" but Boulares refused.
"Luckily, I had my ex there. So I made the first move of grabbing him to get the phone and then I pushed him by his chest or neck to create some distance," she said.
Chenneour and her ex-boyfriend tried to stop the man from fleeing, but the situation intensified when another man entered the cafe.
"They threatened stabbing me. It escalated. I didn't know what to do because if you get off them and you're fighting, is that an opportunity for them to stab you?"
She said she briefly blacked out during the confrontation.
"It went black. I don't know what hit me, but something hit me. Then it carried on and I ended up on his back with my arm around his neck," she recounted.
Someone shouted that the police had arrived and that the doors had been locked.
Chenneour said she then let go, hoping officers would take charge. But the claim that they had arrived was false and the suspect ran off.
Repeat offender Boulares, 18, was sentenced at Isleworth Crown Court on 1 July.
A Metropolitan Police spokesperson said officers investigated a 19-year-old man following the incident at Joe & The Juice but no further action was taken again him.
Chenneour said not knowing the identity of the second man continued to frighten her.
"I can't understand why someone's walking around who has threatened to stab me," she said.
"That just shouldn't be the case. I feel like I deserve to know that person's name.
"How can you threaten to stab someone and be walking around knowing that the guy you did that with is in prison?"
She also said she had no prior knowledge that the CCTV footage would be released, and did not consent to its circulation.
"I woke up to this viral video of me defending myself. I blacked out so I didn't know that I'd done that. Watching that video was just the most bizarre experience. It was like a fever dream."
Asked what message she would give to those carrying out attacks like the one she experienced, she said: "You have no idea what people are dealing with when you rob them, threaten them, hurt them.
"You don't need to hurt people to get where you want to in life. There's a better choice."
The Metropolitan Police spokesperson said officers were "relentlessly pursuing criminal gangs intent on committing robbery and phone theft".
They added: "We have increased patrols in hotspot areas to identify and deter perpetrators."