I hate to break to you since this is a spoiler..,...
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But you're right
YEEEEEES I'M SO CLEVER, THAAANKS HAHAH
Soooo hear me out. I think her real father is the duke.
Cause of the roses and that the father now is trash so how could he love her mother.
They are not blood related either way, but I just have a feeling that she is more noble than she thinks.