I dont think that DC is embarrassed by her at all. They do realize that Power Girl has a dedicated following and some star/sales power...however the people behind the book have little to no understanding of just why the character has such a fanbase and what it is that makes her special on her own and sets her apart from Supergirl (as well as Wonder Woman and every other flying brick of a woman.) Connor and Palmiotti were really the last people to get that