My DD18 is on her first girls' holiday after A levels with a group of friends. She suffers with generalised high anxiety especially around worries about her health and food. She has sent me a WhatsApp showing she has had a small black henna tattoo on her ankle. I am aware of the possible dangers and risks of these; DD is not. Despite having covered numerous risks ( dangers of drinks being spiked, sunburn, riptides etc) this was one I hadn't anticipated. What should I do? Do I warn her or say nothing until she gets home bearing in mind that saying something is likely to provoke a full on panic attack many miles from home. Also does anyone know how likely it is that black henna will trigger a bad reaction? How worried should I be?