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Sienna was born to Ben and Felicity Fredrick (coincidentally, née Fredrick). Her father died when she was a toddler, unfortunately. This meant she was left in Felicity's care. She grew up well and learned all the toddler skills. She also met her future husbands, Don and Antonio, and her future ex-boyfriend, Aaron. She grew up well again and learned to study, and befriended Aaron, Don, and Antonio. When she grew up well again, she went steady with Aaron, who turned out to be the hottest boy in school. This made Antonio and Don jealous, because by then, they had developed a crush on Sienna. Sienna also had a casual relationship with the 'smarties', mainly Antonio, by using her appearance to get them to do her work. However, the teacher was able to recognise that the handwriting wasn't Sienna's, but because the teacher was male and a nerd, he only gave her a D-. In college, she took up Communications and was a Big Sim on Campus. She finished and married Don Lothario.
Sienna plays a big part in how her middle daughter, Bunny, sees high school. She says that high school is fun. However, this was mainly because she was part of the 'hot and popular' group of girls at her school. Antonio says it was bad, however, because you got a lot of swirlies if you weren't there for at least a year. Sienna said that maybe girls had a better time at school than boys, and Antonio said that wasn't true, because the girls at his school were manipulative gossips, and that they must feel sorry for themselves. Bunny ended up crying because she was scared, and both parents comforted her and apologized. By the time Bunny went to school, she quickly became popular and became a girl like her mother.
Sienna is sick of her husband trying to keep Blair, so she takes Sierra and goes to college to refresh her logic. She takes up the Psychology major, and finds out her ex-boyfriend Aaron goes to Sim State University, too. They quickly spend all their time together, and Sienna, who wrongly thought Aaron would be okay with the fact she was married, told him why she couldn't date him again. Aaron got extremely jealous and learned Sienna's chemistry. He found out she liked black hair and fitness, but didn't like stink. He had black hair, but was thin, and stank. So he used cologne and worked out less, but he became fat instead of fit. Frustrated, he quickly started working out again, but came down to normal. Angry, he confronted Sienna (when he was thin again)
and asked why her husband was so "utterly hot yet utterly mean". Sienna was angry that he came to such a wrong conclusion, and berated him for it, saying that dating him now seemed horrible. Aaron was left awestruck that Sienna hated him so much now. Sienna returned home with Sierra after graduating without honors, and was very loving towards her husband.