My eldest son had several gap years from when he was 19, before he settled down. They made him the man he is today. My grandson 23 has also been an adventurer from a young age. He has been to South America twice for 3 months each time. He is off to Australia next week for 6 weeks and then is going to work for Camp America for the summer.
With the internet, I think the world is safer for travellers, they can access help and information really quickly. I would not give her any safety information. 23 is hardly young and she might see it as undermining her. Just wish her well and get yourself on face-time so that she can contact you and reassure you.
Tommy Robinson arrested. Police using their existing powers