A client was saying a prayer for her husband and immediately felt a sharp pain in her back. Was this just a coincidence? What was going on?

This was not a coincidence but was not what you were concerned with, that she might be targeted in even thinking about her husband and wanting something beneficial to happen. Her prayers are indeed shielded from outside listening or interference. So this was strictly an internal reaction from within her own deep subconscious. It was feeling great anguish about the circumstances she has come to focus her life so greatly around, the plight of her husband and her son, and this was simply coming to a head in the moment and setting off an inner emotional reaction. And that is what triggered the pain, it was a multiplication of stored negativity because of all of the trauma she has been exposed to, particularly in witnessing the plight of her loved ones. So while unpleasant and unsettling, this is not a portent of even greater outside interference or manipulation, or any inner feelings of hers. It is simply she is a highly sensitive and emotional being and feels things deeply, and this can knock her off balance at times. She is able to right the ship and soldier on, and that's what counts. Her healing will come in time as well as for her loved ones.