I always find it interesting when fans bring up the reasons Carrie may be pigeonholed; at this point; it must be frustrating for Carrie to be stuck in a mold she wants to break out of.
It seems like a lot of artists don't care about being pigeonholed, and a lot of those artists stick to that image to keep their fans happy. Martina has a fantastic voice, but she's been stuck in a rut for years, to the point where she's almost become a parody of herself. The same could be said for Taylor, Luke, Blake, etc. The general public knows what to expect from these artists, and therefore it becomes pretty predictable and people move on after awhile.
But Carrie has always embraced different styles, and actually proves she will not be stuck in the same rut throughout her career, or become stereotyped as being a certain "type" of artist.
I think the issue a lot of people have with Carrie is that, despite her efforts to branch out, she still comes off as incredibly commercial. She's got the looks, the voice, the personality, and to some people all of that just comes across as too safe.
While Carrie has continued to move forward, I don't really think she's done anything as of yet to make people take true notice of her as an artist. She's making strides, and that's clearly something that's important to her, but IMO, she's still got some work to do if she wants to change the general perception.
Honestly, I think even a small change could potentially make a big difference for Carrie. A different sound, an edgier look, or something to bring her out of her comfort zone.
Carrie does seem to have a disadvantage though, because I'm sure no matter what she does, people will still find something negative to say. I can see why she's perceived the way she is among the GP, though.
I've always gotten the impression Carrie wants to have something for everybody on her albums; I think getting away from that mindset might help her free up her artistic ambitions a bit. While I admire her dedication to keep her fans satisfied, sometimes artists need time to discover they can create art for themselves, and not for other people.
I've always felt Carrie's song selection was a little on the weak side. While I respect that she records songs that are meaningful to her, she isn't likely to create a memorable career off unmemorable fare. So, I think if Carrie just let go a little bit, selected stronger songs, and did something completely unexpected, she could build a different perception. Right now, I can see why she's stuck where she's at, though, and time could change that, if she plays her cards correctly.