Can you first find out a little info about the agency the mother is dealing with? Is it legit? Does it offer classes and is it a registered school under state laws?
Did you make up a contract between you and your client regarding what is to be provided by you and is considered fair use (i.e., they can use the photos for personal use but they are still copyright by you?) Did you write in a contract that you will only provide prints, or only selected digital images for them to print at their leisure if you are not interested in providing prints for them?
If all else fails, give them low resolution digital images (not full res small pictures) that prevents them from either printing them or publishing them on the web with decent quality, so as to protect yourself from being ripped off, until they decide which pictures they want.
Last edited by Oog; 11-30-2011 at 08:33 PM.