The CDC suggsts that the optimum window for Pfizer is apparently 17-25 days (usually 21 is set as the minimum) and 24-32 days for Moderna (usually set at 28 days). They say up to 42 days for either seems perfectly fine. I had my first Pfizer shot not quite two weeks ago and am not scheduled for my second for another couple of weeks - 28 days like a Moderna schedule. I assume because they were scheduling both appointments at the same time and didn’t know which I’d get ahead of time.
However for Astra-Zeneca it is much longer - the optimum apparently is around twelve weeks. So if she got AZ, that looks about right.