Catholicism; If Mary remained without sin after the birth of Jesus does Rom 3:23 exclude her from being of sin?

I'm sure you can piece this together yourself if you really think about it. Have you never seen someone address a crowd before and generalize with the word "all" to refer to the crown when what they were speaking of does not necessarily apply to every single individual person in the crowd? It happens all the time, and this is just such a case, as is obvious by the context.