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[The Three Musketeers] Why is she a villain again?

Why is Lady de Winter considered a villain in The Three Musketeers? Aren’t they all French and isn’t she acting on behalf of the Crown to support the French war effort?

It’s been a while but I kinda feel like she did way more for the war than the protagonists did.
gpt
D'artagnan might be the protagonist, but he has very few traits we'd consider "heroic" in the modern sense.

Milady de Winter is an antagonist because she works for the Cardinal against the queen. D'artagnan fights the cardinal because of what is essentially gang politics and he fights for the queen because the woman he is sleeping with(who is married to another man) wants him to. In many instances he's just barely not betraying the king by doing so.

Milady is also a villain at the time because she is sleeping with different men and not(consensually) with the protagonist. At the time the book was written that was enough for her to be evil.

So, by our modern understanding of ethics Milady de Winter did nothing wrong. She just had the misfortune of living in a time where saying no to the wrong man would get you killed.