Nothing official on her - so consider this rumor:
By using search engines, I found a page, started on behalf of her mother...
It states her mother's husband (not Olga's father) died in May, and Olga died as well, some days/about a week later. Her mother now needs funding to raise Olga's son.
The page shows a photo of Olga, and compared to the picture above, to me it clearly is her.
Via some facebook page, it looks like the police found Olga in her car on June 5th ... (Used google translate to be able to read a post there in the Russian language)
A site called BasicFunerals.ca has a page for her - apart from "Olga Kosogor, December 1, 1983 - June 5, 2018", it holds no further information.
She has a facebook page, latest update from 2007...
I am not a frequent poster here, so I am not posting any links .. I am even unsure whether this post is compliant to the rules ... I have the links, so can post them, but like said, they are not MSM ...