TBH thats a "awful" guess to say 1200 grams, that is very far off, 100-200grams AT MOST and that is if they dont usually way them empty, she is very thing looking for a BP. Not fat and stocky like she should be. Id definitely contact seller as well try to Get her slamming food down to get back up to weight! There should be either a return or money back for that difference.