in general, if there is a liver damage, the child

should experinces vomiting and nausea in the first 12 to 24 hours. but since her blood test showed ok after a while, it should be fine. actually, most drugs are not clinical tested for childern, so, the dose is really just based on adult dose and adjusted by weight. it is not accurate at all anyway. this is the reason doctors don't recommend to take cold medicion for kids. so, just pay attention of kid. if you feel uncomfortable, you can always call her pediatrics to discuss your concerns.
you can always complain to the hospital about nurse's error and attitude. but there is nothing wrong when they called security when you behave overexcited. actually, they call secrurity quite frequently, since people likely have extrem behavior in the stress condition. There is nothing wrong that they called sss hospital and let them know you're coming for what kind of test. anyway, i think there is no point to sue the hospital( you can't sue the nurse) if there is no damage done. so, just relax.