Tori enters as basically an adversary for Maya, but of course she is ultimately short lived and just disappears.
Everything she needs to do as a character, she does it well. Whether its being a stuck-up bitch to Maya, a fun companion with Tristan, or being super into Zig. She manages in a 3 second clip of her crying over Campbell to portray more unselfish emotion about Campbell’s death than Maya can apparently ever do.
I haven’t really looked into it but I guess Tori’s actress wanted to leave the show so she literally goes from being a main to moving away in one season, I don’t think any character has really managed that before.
See a summary here: https://tengaged.com/blog/Brandonator/8628466/degrassi-cast-ranking-intro