She is daughter and youngest child of Simis and Jocasta Bachelor, younger sister of Michael Bachelor, and the granddaughter of Milton Bachelor and Enriqueta Bachelor. Starting from Book 2, she's dating Mortimer Goth.
Bella, ten years old, was first mentioned by Lily, described to be a really nice girl. She was in same age with Jean and Leona. Jean and Leona's first meeting with her was on the school bus where she greet them nicely and they promptly had nice conversation with her. Both Jean and Leona promptly like her due to her nice and gentle personality. Bella also introduced Jean and Leona to everyone in school including her big brother Michael, their senior Kaylynn Langerak, and Mortimer Goth, who acting coldly toward the Redfield twins.
Bella and her family later attended the Goth's feast party. When Leona and Mortimer went into a fight, Bella and Jean tried to stop them. The fight eventually stopped by Gunther Goth, Mortimer's father who later scolded and punished him.
Bella invited Leona, Jean, Kaylynn, and Darlene to her house for a slumber party and allow them to sleepover. Bella then overheard Leona and Michael's conversation, thanking Leona for giving her brother spirit in her though.
Several weeks later, Bella was able to convinced Mortimer to made peace with everyone, especially Leona.
Following the arrest of Nancy Landgraab, she and her friends decide to made a visit to the Landgraab's house to checked on Malcolm.
Four Years later, Bella, now 16 years old, lived just like other ordinary teenagers. Bella was once elected as the prom queen alongside Mortimer Goth. They eventually dating and became a couple and even had their first kiss, this made Bella often teased by Darlene.
Bella later seen in Mirabello Plaza with Darlene when they saw Leona hanging out with Enrico Delgado.
After being informed about Jean's return, Bella was asked by Alex to taught him to made a special cake for Jean. She also attended Jean's homecoming party at the Redfield's house.
Several days later, Bella invited Jean to her house. She told Jean how Mortimer confessed her. She also convinced her to give Alex (who had confessed Jean days earlier) her answer as soon as possible. In the next day, she and her friends learned that Alex would move to Roaring Heights.
Later, Bella and Mortimer became committees for an upcoming prom night and gave the invitation to Leona and the others. She also helped to gave Leona a make over.
In a next day, Bella, along with Darlene and Kaylynn, visited the Curtiz family to bid farewell to them and giving them a keepsake.
Bella and the others introduced to a new student, Astrid Toadstool by Leona.
After graduated from high school, Bella, now 20 years old, would enrolled in Sims University alongside Leona, Jean, and Astrid. Even though, they lived in different sororities. Bella took business major.
She also was still in relationship with Mortimer, who enrolled in a different university. During their semester break, Leona, Jean, Bella, and Astrid returned to Sunset Valley for attend a reunion with their high school friends.
- The reason why I changed Bella's first name as Isabella Bachelor is to distinguish her with not only her original counterpart but also other fanon versions of her.
- Despite the change I made, she's still called as "Bella" by her friends as her nickname.
- Bella is my favorite pre-made sim and my first choice to be featured in my fanon, though as a supporting character.
- In the game I played, she was Jean and Leona's first friend.
- Bella probably knew Charlie's identity as imagiary friend.