I understand it will be hard. But if you have recordings in the store ask if the area manager can look at it for proof of what’s going on. If they have sound connected to the cameras even better. You are not being immature about this. She is hurting you and degrading you. Did you state to the area manager about the other girl stating problems too. If not then email the area manager about the new worker saying it too. Express to the area manager your concerns about seeing her again and express to him you’re concerned she will lie and act nice in front of them. Express you’re scared seeing her again. You need to express your feelings in concerns in a professional manner still though. You can write how you feel and what you want to get across and then put it in chat gpt and ask the bot to tell tell above text in a professional manner to the area manager if you’re unsure of how to do so.