Is the fame she only wanted?
Maybe Valeria Lukyanova made such an effort to look like Barbie because she wanted to be famous. She wanted popularity, fans, likes, and fame. What is wrong with it? She is not the first and certainly won’t be the last to try something different in order to become well-known.
Valeria found something that no one before her had done and took the opportunity. It is possible that this was her reason, especially when you consider how young she was when she started the transformation. Are you familiar with Occam’s razor? It is the problem-solving principle used in philosophy.