If she thinks she might drink, don't go. No way would I jeopardize my sobriety. If, on the other hand she is safe in the knowledge that she won't drink, then go and have an amazing fabulous time. I've been on a short break holiday to Spain with family and, as is quite usual the first night we were there a couple of peeps got drunk. The next day was a sorry sight to behold as they struggled through the day with terrible hangovers. Omg, that definitely would have been me. I could feel their pain lol.