I would say copy this thread and give it to her, encourage her to join this place and listen to what other people say, including experienced Doms, and pop into the chat room too.
When you say she has taken lots of precautions, does that include active safe calls - i.e. if she does not ring and give an agreed secret code word during that call it is a cry for help. And does the person who is going to be taking that safe call, know what her plans are, and do they have the personality and ability to do what is needed if things do go wrong? I know that is all covered above, but it is sooooo important.
cariad