She has reason to be scared. Campaigners say that standing up for the rights of Black people in the UK comes at a high price. They say they've seen an angry backlash and have even received death threats.
Attending a march last month against a proposed bill to increase police powers at demonstrations, Aima was flanked by two White allies. Assigned by a trusted volunteer group, they are there to help keep her safe.
"If you are constantly getting people saying they want to kill you and they want you dead, then you don't feel safe anymore, you don't feel safe at all," she says.
She says the allies also help deflect unwanted attention from her detractors and from the authorities, whom she does not trust.
Speaking to CNN at the march, Aima, who uses only one name for security reasons, says some of the Twitter messages she has received in recent months have left her fearing for her life.
"People were bragging about the types of guns that should be used against us," she says, recalling another tweet which read: "Go die, I'd do better if you weren't breathing."
"I am getting quite a lot of threats online, but not just me -- other Black activists too," says Aima, adding: "This is just a normal daily thing for us to have to witness."
But her lack of trust in the police means these threats go unreported.
She is not alone. In the UK, public trust in the police and other institutions has been eroded by examples of systemic racism
A government report on race and ethnic disparities, which concluded that the UK "should be regarded as a model for other White-majority countries," sparked outrage.
Activists say the government commission's statement that it, "no longer see(s) a Britain where the system is deliberately rigged against ethnic minorities," means that race relations
are effectively going backwards.
Anti-racists blamed for racism
When Britain's first female Black Member of Parliament, Diane Abbott, tweeted a message of support for another Black activist recently, she was accused of stoking racial tensions.
Blaming anti-racism campaigners for racism appears to be a mind-boggling but growing trend in the UK.
Outside London and other large cities, where there is less diversity, the vitriol is even more direct, said Sarah Chevolleau, founder of the Stoke-on-Trent chapter of BLM.
Chevolleau says she received a death threat just 30 minutes after calling for the first BLM rally in the central English city last June, from the influential head of a football supporters' group.
"It's not shocking for people to be so open with their racism here," she explains, "It was really frightening. I took extra security precautions at home, but I had to keep talking. I had to keep speaking out. I feel I didn't have a choice."