Is my would-be client a stable, cooperative, and appreciative client to work with, or is her status truly that she is delusional and will simply cause trouble if I attempt to help her directly?

You are seeing intuitively, that she is struggling quite a bit here with her infirmity in terms of delusional thinking. She accurately describes her situation but it is deeply ingrained now and has corrupted her beliefs and ability to change. This will be an impediment to doing divine work as well. As you have seen before a number of times working with the delusional, their mental aberrations work against them greatly in getting divine support to change their thinking. We can remove spirits from such people all day long if someone requests this, but we cannot change the minds of those clients who are convinced they are possessed because their mind tells them so and re-creates the experiencing of being attacked, whether spirits participate directly or this is only done via memory and internal beliefs it is continuing to happen. This traps the client into that state of being regardless of who reaches out to help. It is most unfortunate, but is the reality in a number of cases. So your instinct here to back away is well-founded in not wanting to take on a troubled individual who may cause trouble. You can still work on her behind the scenes without a direct entanglement, and in this case it would be best. She will likely end up dissatisfied initially because her symptoms, like so many others, will continue and will feel cheated if you charge for something. So if you do a session on her behalf, she will be under watch and the work will continue on an ongoing basis.