What is the process for transferring an ED visa from an old passport to a new passport for my niece returning to Thailand?

To re-enter Thailand with a new passport while having an old ED visa, your niece must bring both her old and new passports to the immigration checkpoint. She should present them to the immigration officer to have her entry stamped in the new passport according to the re-entry permit in her old passport. It’s important to ensure the stamp is correctly marked with "Non-RE" and reflects the correct dates. Upon returning to Thailand, she should consult her school regarding the process to transfer her visa or extension of stay at the immigration office, although typically only extension stamps can be transferred, not the visa itself.