"There's no correction in post-processing or in printing."
Never been in a darkroom have you Bob from Boston? 
"And most places developing film scan it to digital rather than automatically making prints, so I'm not sure there is any advantage to using slide film."
The places I use develop film exactly they way they always did it. Even my Walgreen's develop film. They don't do slide film in house but it develped exactly the same way as it alway has been done. My local camera store has all the exact stuff to do it yourself as they ever had. Even B&H offers an E6 slide film developing service.
The biggest advantage in slide film is it can be pushed and pulled. Negative film can not since it is dye based.
My F1n sees service once in awhile just to remember the good ole days. 
@ebiggs1 wrote:"There's no correction in post-processing or in printing."
Never been in a darkroom have you Bob from Boston?
I have, as it happens, but I've never processed slide film. And I'll be very surprised if the OP's daughter ever does.
Bob from Boston,
"... I'll be very surprised if the OP's daughter ever does"
Maybe, maybe not. But it doesn't mean, "There's no correction in post-processing or in printing."
It does mean you or they or whomever won't be using a mouse!
