To use a wrist harness on 7 year old at a concert?

[notmysundaybest24]

Hi I'm brining my daughter 7 to a concert at a stadium soon. I'm probably being a bit anxious here but would I be safer to get a wrist strap for us to keep her close? We are seated at the concert but it's leaving the venue when everyone is rushing to make it for the last train/bus I worry about.
I've been to concerts before with friends and my husband and we've never lost each other and I never worry about it if we did as we're all old enough now.
She also knows what time do if she got lost. Would a wrist strap be a bit too much do you think?

Please don't leave before the last couple of songs; they're usually the "big numbers" and for a young fan at possibly her first concert, let her have the whole experience..

We did for the first one. DD had a meltdown because the crowd takes forever to disperse outside our local stadium and she was terrified of all the people around her. We leave a car nearby the night before now and check the set list to decide when to go. She usually likes the more unusual songs than the big hits so it works for us.