Isabella is Mia's twin younger sister, though not Mia's twin. Her twin is Isaac. She is not to be mistaken for Isabella, one of the minor characters in the show with blond hair in the style of Emma's hair and green eyes. Isabella is Mia's baby sister, and she looks like Mia, with Mia's red, auburn hair and honey, amber eyes. She also has a face full of freckles like Mia.
Isabella is Mia's younger sister and a twin to Isaac. She is happy, friendly, outgoing, and a troublemaker. She and Isaac get into a lot of mischief being young little twins, and she loves to get into trouble. Isabella works at her hard best to be a good little sister, but can get herself into a lot of messes.
Isabella is a small little twin sister and the twin of Isaac, and little sister of Mia. She is generally a good kid, but can get easily rambunctious. She is fun, fun-loving, and Mia loves her. She likes hot cocoa and was drinking it with Isaac when the two couldn't be found in "Travel diary part 3: All eyes on the siblings". She loves hot chocolate, and got some from Wally when Mia and the friends were babysitting them. Isabella is a wild little ball of trouble, and can get into it pretty easily. She wanted to even decorate a snowboard with Isaac when Emma had them make one in "All eyes on the siblings". She, like Isaac, can drive Mia crazy! But she always learns her lesson!
Isabella is close with Mia and Isaac. She likes her cousin Stephanie as well. She is best friends with her twin brother Isaac.
- She looks like Mia with red hair, amber eyes and freckles.