That seems really far to me too. I don't think it is a good idea to let a 10 yr old walk that far.
But what's done is done.
ETA: I see she was meeting her friend at the park so maybe not walking that far.
It's .5 a mile- 2,640 feet.
We are from Colorado and now live in another active community- kids routinely walk 3 miles just for FUN. Walking 1/2 mile to school verses a longer drive or having to get up earlier to catch the bus- kid chooses to walk- I understand that.
I think we can agree that those on WS are not the type to ever let their kids walk alone (me included- NEVER) but seriously- a 10 year old walking .5 mile is not only reasonable, it's downright short. Kids need physical activity just like adults do (actually, they need more!).
Just my .02, of course, sure many disagree.