I think you need to ask yourself, is the extra time you are spending worth the money that you make having them as a client? If it is, then chalk it up to 'part of the job', and try not to get too frustrated.
If it's not, then you need to contact the owner, and explain that you're unable to provide the support services that their staff is asking you for, or simply begin responding to their questions with 'you already have it, I'm sorry but I'm not able to assist you further at this time'.
Optionally, take 2 days to respond to their inquiries, by which time they will probably have figured it out for themselves. Don't spend more time on them than they are worth, and if they try to claim more time...put it off until they aren't using more time than they're worth.
Of course, this is just my opinion--I am not a photographer, and I know nothing of the business.
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