unconscious sedation for a cavity filled?

My daughter (7) is scheduled for unconscious sedation at a local children's hospital. She has been to a wonderful dentist multiple times and won't let them even clean her teeth. I've tried talking with her about it but she gets so anxious :(. The doctor said that conscious sedation wouldn't be an option for her because she is just so anxious. She is a very sweet girl but has really bad anxiety with dentists and doctors. I'm just scared because of the risks involved with unconscious sedation (im a registered nurse which doesn't help). Any advice for me would be greatly appreciated?
- anxious mom of an anxious kiddo 

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