She entered Hogwarts with the class of 2026, mostly staying to herself, and as her name was called for Sorting, Alessa was truthfully hoping for Gryffindor like her brother, but was also not surprised to see herself into Slytherin. She attended class alongside the Lions, trying not to draw attention to herself in anyway. In her first few years, Alessa made friends with two Hufflepuff students in her year, Alyss Roanoke, and Jasper Mitchell-Anderson, which effectively allowed her to start talking to other students more and more.
Most of the years passed smoothly, with one thing happening during her fifth year: She met a Slytherin, Kedric Woodhouse, and after talking, they started dating. It was revealed later in the year that the current Head Girl, Charity Bagman, accused him of drugging Alessa, which one thing led to another, and Kedric was soon expelled from Hogwarts. That ended Alessa's relationship with him, and also on her brother's wishes. During her fifth year, she was also selected for Slytherin's girl prefect, beating out Faith Bagman.
Her sixth year brought more trouble and one more friend. Melody Padmore may have been a Hufflepuff fifth year, but over the weeks, her and Alessa started hanging out more, developing a strong friendship that still holds to this day. She also started studying to become a Healer in this year as well.
In her final and seventh year, Alessa was selected as Head Girl, and worked alongside a seventh-year Ravenclaw named Oliver Whitacre. Also during this year, she grew closer to a Gryffindor, Madan Atherton, and found herself starting to develop feelings for him. However, she confessed and they started dating a little bit before graduation.