At that age, even if certain situations are objectively worrying, overly alarmist messages tend to undermine our credibility. Therefore, it's important to adjust the message you want to convey: transmit clear information, without downplaying what you've observed, but without dramatizing or causing alarm.
During adolescence, the idea of "it won't happen to me" or "this isn't serious" is very common. Rather than dwelling on the danger, a dialogue-based approach usually works better: asking her what she thinks, what she saw, how she interprets what happened to her friends, and how she feels about it. This way, it's possible to support her with useful and realistic information, strengthening her ability to take care of herself and make safer decisions.
It's important to keep in mind that the results of these conversations aren't always immediate or obvious. Patience and a gradual approach are key.
It is important to convey clear information, without downplaying what you have observed, but without dramatization or alarmism.
Adjusting our perception of risk can also be a useful strategy. When a person feels dizzy or starts vomiting, we're talking about a moderate risk ; experiencing very low energy, drowsiness, or motor difficulties after these situations is common. On the other hand, when someone faints, the risk is already high ; and if they lose consciousness or experience lapses in consciousness, we may be dealing with an alcohol-induced coma.
Talking about harm reduction guidelines is more effective than a fear-based approach. Messages like drinking slowly and at your own pace (avoiding games), not mixing different types of drinks, not drinking on an empty stomach, and alternating with water are strategies that help prevent harm and escalation to undesirable situations, including those you mentioned.