how to understand the sentence?

She was not accepted because of her birth. (This could mean where she was born, or what ethnic group she was born into, or what social or economic class into which she was born--we don't know without more context.)

She was accepted in spite of her birth. (Which means that there was something about her birth which could prejudice someone against her, but that she was accepted anyway.)

You don't provide enough context for a more comprehensive reply, because we can't know what it is about her birth which the author considers significant.

thank you! There is not a helpful context for this sentence. It only stands by itself. Anyway, thank you again!