She definitely was. As a young woman, she had a mysterious illegitimate pregnancy before she ever got married, father still unknown (though there are speculations). Then her parents married her off to a court official. Who already had a mistress installed in his household and intended to keep her, thinking he was doing his new "damaged" wife a big favour in marrying her to begin with, and they should just live with his mistress because he says so. This, however, did not wash with the headstrong Anna Constantia who stunned everyone by demanding a divorce. At this point, any hopes her parents might have had of her living a non-scandalous not talked about life were buried, but when her house got literary on fire and she dealt with the danger bravely, she attracted the attention of August. Her (ex)husband tried to warn him away, saying she was far too headstrong to be a good maitresse en titre, but August did not listen, and history ensued.