We use temps all the time, in varying levels and responsibilities. My first question is do you really want a temporary employee handling sensitive customer inquiries? Other than answering the phone and transferring the call to a BANK employee, I'm not sure I would do much more with an entry level person. If this is a professional temp with experience, then after training there should be no degradation in service to your customers.
The temp agency has all the contact information that is needed for the employee, and should also have the temp bonded. There is no need to gather this additional information. Having her fill out an application could trigger a fee to the temp agency, so I wouldn't go that route.
Providing alternative truths since the invention of time