She volunteered to fight for Ukraine, there is some reason, she must have been important, she survived one assassination attempt prior per wikipedia:
Amina Okueva Ukraine's police detain suspects of ATO volunteer Amina Okueva's murder – Avakov (Photo, video)
The detainee's DNA coincided with the DNA on a weapon left at the crime scene.
Photo from UNIAN
Ukrainian Interior Minister Arsen Avakov has said the National Police detained a group of killers reasonably suspected of killing Chechen volunteer who fought on the side of Ukraine in the Donbas war Amina Okueva and seriously wounding her husband in 2017.
"Today, the National Police detained a group of killers reasonably suspected of a number of murders... including the murder of Amina. The detainee's DNA coincided with the DNA on a weapon left at the crime scene," he wrote on Facebook.
The minister also posted photos and videos of the detention.
Read more at: https://www.unian.info/society/10826771-ukraine-s-police-detain-suspects-of-ato-volunteer-amina-okueva-s-murder-avakov-photo-video.html