Another one!!
The ogs from Miraculous amino or who was obsessed with the show at some point. (Cough cough) would know this one.
Zoe was actually introduced mid-season 2-3 with a brief design/concept art of her. (It waa around the time they created a concept art for the new hawkmoth) During that, they said that a cousin of Chloe from far away would introduce herself soon.
So zoe was meant to be her cousin. That was why I wasn't really shocked by her sudden character but how they assassinated my gal Chloe just for her to seem nicer.
There was actually a fee fanfics that written Zoe way better. Of course, back then, we weren't even given a name, so those fanfics actually had different names for Zoe.