Outside of an alternate universe, Jean and Emma should NEVER be friends. They have no reason to be and I dont get why some people want it so bad. Just doesnt make sense with them. I can see them being unwilling allies at best. Jean has reason to never trust Emma and Emma has reason to never like her. Their personalities and ideologies are also too vastly different. Emma herself does not have many if any women she can truly call a friend so I definitely dont see Jean being that for her nor Emma being vulnerable enough with Jean to allow her in