Re: Asked to wear a colour?
I don’t know what you’re confused about. You don’t like her. She doesn’t like you. Period. But since you are cousins, you’re forced to deal with each other on family events such as weddings.
There is nothing to “analyze” here. Wear whatever color you’re told to wear and move on. Focus on your own wedding.
I understand that you wish there was no pretending but that’s not going to happen. If your cousin had any intention of communicating openly with you, she would’ve done so already. Since she hasn’t…you need to understand and accept that “hint”, and move on.