You know, I would never consider Amber "heavy" at all. Shes 5'4 [which = 162cm] and she weighs 110 pounds [which = 49kg] Which i think is pretty thin! And healthy! And apprently if you see her in real life, she looks a little on the thin side. It makes me wonder how thin Emma and Sarah Michelle are. [Granted we have to take into account that we're comparing this to the OMWF episode where they were all dancing together, that was 5 years ago]. I personally find Amber extremelly attractive.
I guess in show business being that weight and height would be considered "heavy", but in real life, its perfect.
Did i mention Amber is so gorgeous! She's just naturally beautiful, her smile is really warming, and she still looks amazing in non make up photos ive seen. She even still managed to look beautiful when she was ill.
Anyways, ive ranted, but thats my opinion.