Valerie Walkerdine is reading different sorts of girls' comics from the ones I read as a girl, and indeed ones that don't reflect the wide range of girls' comics, I think. There are girls' comics that give that sort of message, but there are also plenty which have an all-female or practically all-female cast, and hence the finding of the prince is not the focus of the story. The Four Marys or the Silent Three are faced with mysteries or problems which they must resolve themselves, generally without recourse to outside help.

I would suspect that the majority of girls' comics, apart from specific romance titles, would fall outside the the constraints she sets out above. There are other constraints in terms of what futures the girl characters see for themselves - being nurses rather than doctors, for instance - but agency on the part of the girl characters is a big part of those comics, necessarily, given the deliberate and overwhelming lack of male characters in most stories.