how do you stop them becoming one of the teens who hang around town centres looking bored and a bit menacing

[Notmyidea]

Older dd seems drawn to this form of spending her time this half term:(

I get I'm putting her off being at home, it's where she gets nagged about homework told she needs to turn the telly off. (I've provided activities and had her friends over, too.)
Any ideas?

I saw a group hanging around on the street corner earlier today. Just purposelessly hanging about nattering like they had nothing better to do with their lives. Looked about sixty, I'd say. Females. Shocking it was.

I can see why you are a bit concerned, but as others have said its quite normal.
The only addition I have is if it interferes with homework, and it becomes priority on hindsight I would do more to reign them in.
I do think if they are going to do it they will, and not much will stop them.
As long as they aren't causing trouble or doing anything illegal.
Are they children you like that she hangs around with?

I just thanked woman from church for letting me know.
As far as the other kids go I generally like them. One is lovely best friend who is going through a batshit phase as parents are going through a rather ugly divorce and one is a new friend I have some reservations about. Someone dd described as "a really convincing liar!" which is apparently an admirable quality in someone who hasn't done their homework!
Combine that with occupying the same space as year eleven boy who has apparently been temporarily excluded and his mates that has my cage rattled.