You may be looking for her 2nd Dimension counterpart ; her counterpart her stone age counterpart her counterpart , her Victorian Era counterpart ; the voice of Milly , Isabella Murad ; the voice of Katie , Isabella Acres , or Isabella's Star Wars counterpart. She's the leader of Fireside Girls Troop and often volunteers to help in Big Ideas , usually with her troop being involved. When on duty, Isabella works diligently upholding her position in the Fireside Girls and earning accomplishment patches. Though when trying to find the purpose of a machine, Baljeet did jump at the chance to have a romantic dinner with Isabella, even a staged one. She won a bet against him on who would win the fight between Buford and the squid " Voyage to the Bottom of Buford ". Approximately " Act Your Age ". As nice as Isabella would seem, she can get angry.
Delaney. Age: 27.
While attempting to climb Danville Mountain, Isabella shows significant enthusiasm for Baljeet's eagerness to perform the task without the help of any of the Flynn-Fletcher brothers' inventions, which stands in contrast to the attitude of Ferb and, especially, Phineas " Bully Bromance Breakup ".
Rory. Age: 23.
Isabella and Phineas's relationship
Approximately " Act Your Age ". When she was at work at her mom's restaurant, she wore a light green dress with an oxeye daisy on the chest with two dark green leaves on both sides, a blue belt around it, and shoes. Victorian ancestor  Princess Isabella Isabelock. Less than 15 officially , but presumably between 7  to 12 years old    She is a year older since " Happy Birthday, Isabella ".