Who are her sire and dam?
Its not reall fair to critique a pup with such wonky pictures.
The first one she is very roached, I would worry if this is how she naturally stands, but she's running, not standing...and someone just grabbed her tail.
The second one is better, but she's on a slippery surface, so more than likely not standing securely. She looks very hocky, which I am sure is just the photo...she looks to have a cute face.
I had 9 puppies and they were never thin, nor do I think this one is, I just don't think she is substantial. Fat will not equal substance.