When we first got acquainted with Patricia , she was presented as a sluttier , more sexually open , rebel version of Sofia . Personally I don't think haircut C looks bad . Not at all actually . But it definitely fits a "well behaved wife" more than it fits a "corrupted" sexually open woman . The haircut is the most obvious and subtle ( at the same time ) way of pinpointing a personality .
But the whole "bad girl" persona that surrounds Patricia will take a hit . Whether the hit is huge or not even noticeable is purely based on the player's subjective view on what's what . Everybody has a different perception on what's rebelious , or slutty/ attractive .
Hell , I would even say that the people who chose haircut C are not attracted by Patricia's bad girl personality and choosing that haircut means bringing her into the realm of appropriate boner material . And that's totally fine . This change will definitely make her look more "realistic" . She won't be the obvious bad girl now , you'll have to read stuff to determine that ( too bad version 0.1 exist to spoil that )
All and all , as long as the haircut is not repulsive , I don't think there will be any major change in Patricia's character . In the end the personality and words matter more in defining someone's personality than a haircut does . You can be an attractive opposite to Sofia with haircut C , no problemo .