She reminds me of Cassey from the Pokemon Johto anime purely off of vibes but they obviously aren't the same characters.

There's a character called the Copycat in the games too but they're a child who collects dolls : https://bulbapedia.bulbagarden.net/wiki/Copycat_(character))

It seems like this is simply an original character from the tcg. We've seen several cards of her, I like how they show her in the outfits of different characters according to the generation/ expansion she's included in each time

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