I've worked a little bit in youth services for offending. Invariably the girls were trauma-impacted and more often than not there was a boy involved in the offending.
However, not putting them in young offenders places may well mean, 'leave them to the wolves'.
I wish we had very well run youth offending centres. With houses, nice staff, lots of services, lovely space, gardens etc. I briefly volunteered in one in Canada and it was MUCH nicer than UK.