How to make a safe space for my friend's Yoga Nidra per astrology advice?

A friend of mine has been feeling quite anxious and restless lately, so I’ve been encouraging her to try Yoga Nidra to help her relax and find balance. However, I also want to make sure she is completely safe and comfortable in the practice - emotionally and energetically. Can astrology provide any advice for how I might make a calm space that makes her feel safer and more open to doing Yoga Nidra?