"Did she actually get that confirmation?" used to be two screens: the messages in one place, the changes behind a small icon in the other.
What is new
Every appointment has an Activity tab: the messages sent and the changes made mixed together, newest first. You can see who changed something, when, and what exactly changed.
You can filter it by what kind of entry it is, what the change was about, who did it, and what became of a message. If there is only one email and one change, you do not see those filters: a filter bar above two rows helps nobody.
Sending an email again
If a confirmation did not arrive, you send it again from that same timeline. That works on the kinds of message where it can; on the rest there is no button, instead of a button explaining why it does not work.
As a staff member you see slightly fewer entries than an owner or an admin. What it says about payments is shielded in the same way as the rest of the payment details.