I have another crazy story plot theory, what if white bone spirit use the girl she posses to get to close to be friends with the team to gain their trust enough but Mei notices something off about her and, for some reason, she was able to feel some kind of energy that is quite hard to describe every time she gets close to her but the posses girl got Mei and MK in a serious argument causing Mei to leave MK alone with the possess girl so White Bone Spirit can leave the girls body and possess MK.
Then Mei would come back to apologizes after their fight, only to come back to see all the damage MK cause but could find her friends anywhere but was able to find the girl who is free from White Bone Spirits control and told her everything that happens and White Bone Spirit posses MK as her new host. The girl helps Mei track MK on her motorcycle. They are able to find their friends only find Pigsy, Sandy, and Tang knocked out unconscious and sees MK destroying Bull Clones, and fighting Red Son who has some injuries from the fight (even though MK teamed up with Red and Iron Fan, they are still going back being enemies), Mei was able to get MK's attention before he almost kills Red Son, and only told him that she came here to apologizes about there fight earlier only for MK to attack her. As the two friends fight, the girl was able to take care of Tang, Pigsy, and Sandy as she treated their wounds, MK has beaten Mei until she is too weak to fight back, giving him an opportunity to finish the job until an unexpected ally was able to save her on time and didn't hesitate to take a hit for her was help able to her knocked White Bone Spirt out of MK.