Her primary problem is that she is dumb as a post.
It prevents her from making a coherent case for or against anything on behalf of her constituents.
She has made it this far because she is a loud-mouthed shrill woman whose frequent idiocy is never analyzed by the press so the average Democrat mistakes it for wisdom, and no Republican has dared confront her since there aren’t many of them in Massachusetts.
She would twist herself into fits trying to debate Trump.