For people confused about timing...
Her school starts at 8:30 but she needs to be there by 8:25, DDs is 8:50.
DSD sets off at 8am, I set off to drop DD at 8:35ish as I have to park up and take her in, I then carry onto work.
DSDs school is past DDs so I'd have to set off about quarter past, drive to DSDs school, drop her off, drive back on myself to drop DD at school and then go back on myself again (toward DSDs school) to go to work. If I get stuck in traffic I could potentially be late for work as I only 10ish mins to get there as it is.
I could potentially drop her off at DDs school but I'd have to drop her there with enough time for her to get to hers for 8:25 meaning I'd be hanging around DDs school for half an hour and she'd miss being able to walk with her friends.
If it was pissing out of the heavens I would drive her because it is just lousy not to.
I've already said it wasn't.
It's not actually anything to do with her 'not being mine', if you read my posts you'd see I used to take her all the time when she was at the primary. But she's old enough now to walk like all her friends seem to do which makes my morning easier. I'd let her walk if she were mine too, it's nothing to do with that.
I do think if her parents have a problem, they are welcome to be late to their own work to take her.