AIBU to leave DD(12) home alone for the evening?

[Joolsy]

OH and I are going to friend's for dinner. We are struggling to find someone to babysit. DD will be 13 in Sept and is super-sensible. WIBU to leave her from about 7-11 on her own?

My DD is just 13 and we have left her in the evenings a few times now - she LOVES it!
We have left her in the day since she was about 10-11, gradually building up the time and now will occasionally leave her and DS (10) alone together for a while as I think he is responsible enough (he is walking home on his own from school for the first time today whilst I MN to distract myself :))
If your DD is happy then go for it.