Isabella Flynn (According to Tiberius64)

This is Isabella Garcia-Shapiro in the future; she obtained the last name Flynn when she married Phineas Flynn on June 14, 2025 (Love's Full Blossom). To date, nothing had been said about their children. As of 2025, Isabella was an ranked officer in earth's unnamed exploration fleet (holding the rank of Lieutenant Commander). However, she mostly remained on earth helping new recruits at the Flynn-Fletcher Academy as her job.

Love's Full Blossom
Here, she first becomes Isabella Flynn, as she gets married to Phineas Flynn, whom she has loved for most of her life.