It is fine if the client believes that this is a mysterious and magical activity and she expects great results. That is great, that is very helpful. But the problem enters if she isn't present along the way. If she expects miracles AND she is actively involved in getting them, that is the best of all worlds. BUT she is out to lunch all the time, expecting that it has nothing whatsoever to do with her, that will only give mediocre results.
Processing has a lot to do with the client.
Actually it has ALL to do with the client. She is doing it. If the client has the mistaken idea that processing is something that will happen to her, and that she ought to sit and wait for, then she isn't doing it. The client doesn't have to do the processing consciously. For that matter it is the sub-conscious processing that is most valuable.