At this point no one really knows. Which is perhaps how she likes it, since dancing in public this way is forbidden under the Islamic Republic's legal system.
What we do know, however, is that she is spreading feminist propaganda; the song we hear is called "Salute", performed by the British group Little Mix. Take a look at the lyrics:
Ladies all across the world
Listen up, we're looking for recruits
If you're with me, let me see your hands
Stand up and salute
Get your killer heels, sneakers, pumps or lace up your boots
Representing all the women, salute, salute!
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Sisters we are everywhere
Warriors, your country needs you
If you're ready ladies, better keep steady
Ready, aim, shoot
Don't need ammunition, on a mission
And we'll hit you with the truth
Divas, queens, we don't need no man, salute!
A brave soul, no doubt, but the person behind the Facebook page that initially posted the clip is well aware of the risk. “I was scared to publish this video at first. I waited for a while and then I saw it online on another personal page and I saw that it was public. Then I published it because the face was not shown and because the girl was trying to keep her scarf on," Masih Alinejad, an Iranian journalist, told The Independent.