While fully evolved Pokemon are typically stronger, strength isn't the determining factor for prices in the Pokemon TCG, as more often than not, popularity and visual appeal win out over other factors when determining a card's price
She powers up your whole attacking board with +1/+1 counters before damage hits, which is exactly why she ranks among the best Vampire Commanders MTG for wide, all-in attacks
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As a result, this card is mostly a financial dud
I don't know if will help, but Romhacking (their wiki more specifically) has notes and such for tcg2 that is already documented which could help