Ask her if she can drive safely. Wait half an hour and compare her behavior before and after. Moods may swing from joy to fear. The user may become excited and then become listless and sleepy. Time and space judgments may be distorted.
Reaction time is lessened.
Call for another means of transportation. Avoid using drugs of any kind. Become a designated driver. The percentage of alcohol in the blood resulting from one drink varies with the a. Amount of exercise. Weight of a person.