She doesn't act like Samus because in the strictest sense, she's NOT Samus.
That's an interesting an odd headcanon, I think you should definitely start another topic on it.
I say this because the entire Ridley thing is also strange; the baby Ridley had to be born/ cultivated on the Bottleship as a clone of the original. Ridley can not be a baby because in SM he was fully grown and he was destroyed by Samus. (Previous to SM it had always been the original Ridley through ZM>MP>MP3>SM)
Also, on topic, I'd be totally cool with a Vanillaware Castlevania, but at this point, I'd be cool with an ANYTHING Castlevania that isn't EROTIC VIOLENCE. Unfortunately, Uzo and VladCT are dead on the money.
Give it to Vanillaware, nobody else is doing anything with it.