DD fell yesterday and grazed her arm quite badly. Her hair needs washing and I agreed it could wait until today. She wanted to go out to play after dinner and I said I'd help her with her hair provided she was back by eight thirty. I had to call her in at nine - she's now in a massive strop as I told her she's on her own with hair washing. She says she didn't know the time as she doesn't know where her watch is. I say the options were clear before she went out and she should have found her watch / asked a friend to tell her the time. She's crying in the bath as I won't help her. AIBU? too harsh? She's 9.