I've tried asking a similar question and I still can't say that I understand this concept of past perfect. If you are talking about events that took place on the same day in chronological order, why do you still need to use past perfect? Please see my sentence below, which I think is fine.
She was talking to her supervisor when I got to work this morning. Then as I was leaving, I saw her talking to her supervisor again. Something must be going on.
Also, even when I'm talking about yesterday and today, why do I need to use past perfect if I'm talking about them in chronological order?
She emailed me yesterday to tell me that she was going to visit me next week. Then she emailed me again this morning and told me that she can't come. That's why I was grumpy all day.
Does the sentence above need past perfect anywhere?