And her not speaking with an "Ukrainian accent" points to her being a child, not an adult. Children pick up languages very easily, while adults don't. Her not having an accent points to her being a child when arriving into the US, not an adult. Having a good vocabulary after being in US for a short time points to the same thing. Many arriving as adults take a long time to get a good vocabulary.
The doc series says her birth year as 2003 and she was adopted by this family in 2010.
So when did she come to the US? How old was she when she came here? Did she speak?
How many times had she been adopted And returned?
In the video footage from the doc series- It is clear to me that she is aging and changing in her maturity in speech and facial features.
Do I think she was born in 1989? No. I think it is possible she was a few years older- 2-3 years, but not 10 years older.
Does she have cognitive delays? Or was she still trying to learn English?
Did she attend school? This piece of the puzzle was not shown in the doc series. What did her teachers have to say? Were there issues with peers?
What type of screening did the adoption agency do if they placed her with a family that turned out not to feel committed to her disability, well-being, and schooling?
If she was born in 2003, she could be 20-25 now. She isn’t a child anymore- and likely could now have the funds to not be as vulnerable as she once ways. If she is the monster the family described- they will be her target for revenge.
JMO