I'm not disputing her hard work. I know she busts her chops every day. I kinda of figured that she was still a utility - three years in, it's unusual for any carrier to get a route. I was a utility for about a third of my career, and know what it is like to be one.
About the different routes she does. Yeah, that's Florida. Philly has almost no curbside delivery. Usually, it's two or three streets on only one route in the ZIP code. That's why it's ridiculous for "our" trainers to spend so much time on skills that they will never use. If they are training people for the outer rings of the suburbs, that would be fine.
I'm not impugning your daughter's work ethic in any way - I've humped mail for 33 years as of the third, and it's a tough job where you get no respect from anyone, except another postal employee.
We just had a guy transfer into my station from FLA. We worked in an area where Amazon didn't have a delivery service. He routinely delivered around 6-700 packages daily, and was doing 3-4 hours of overtime on his own assignment.
During COVID, I worked 105 calendar days straight. I averaged 85-90+ hours a week for a couple of years. By your timeframe, she became a regular during COVID, and to me, that proves she's tougher than woodpecker lips.
Since they ask for trainers based on seniority, I'm kind of surprised that there were that many nopes before it filtered down to her, that's all.