Its not a rare thing that an SP who is with a new agency will keep seeing old regulars by her own methods. An agency is not a contract. They basically offer incalls and advertising for the SPs. Thats it. Altough it surely is questionable to take advantage of an agency networking and give a private number to any Joe, if its a client that she has been seeing for a while and they already booked between themselves, there is no requirement for her to tell him to contact the agency. Its a client she already had, and if they have their own way (either an hotel, a house or some other incall she can use) then whats the issue. She does not have to take a cut by passing by the agency for a client she already had.