She‘d said it with annoyance I’m sureI think the topic of Mia calling Mabel a Toad and a pig, is all to do with the situation. For example I call my Daughter my little piglet, it's a nickname given with love, she smiles and laughs everytime. Mainly because she loves food and has always been the cutest chubbiest little baby. My Dad always tickles my nieces and nephews when hes caught them in a fib and calls them lying little toads when he is tickling them and laughing. These nicknames and names are all situational, I think it is all about whether it is said with love or with passive nastiness