‘I have just arrived by train,’she said.变成间接引语

She said that she had just arrived by train.
主句said是一般过去时,那么从句也要改为从属于过去的时态.现在完成时就要改成过去完成时.一定正确吗？你就放心吧。我是英语教师。当然，说到时态问题，如果从句说的是客观真理，那么即使主句是一般过去时，从句也应当是一般现在时。请问尊姓大名？Ah, it's a secret!谢谢您啦！