My client [name withheld] is depressed and hallucinating again. What is the best way we can help her?

As you surmised, she has been re-infested with spirit meddler attachments and they are simply stirring things up once again and triggering some of the old soft spots. There has been some progress in healing for her but not enough yet to counteract this vulnerability. This is going to be true going forward as all humans are vulnerable in the final analysis. When there are dark spirits present within the energy, they will find things to reawaken, and this cannot be fully blocked when people make themselves vulnerable. She simply needs an extra cleansing at this point in time and this will help things ease.