I feel your pain. Thus the reason why my name is Many Hats.
This is surprisingly common in small financial institutions. The trick to it is this: if they want you to continue producing, you should not be auditing loans that you originated. If you are a top producer, this can be a challenge. You should also not be auditing loans that you approved (in the event that you have such authority). So, depending on your situation, the bank may need to make a decision - do we want to lose her as a producer, or hire another auditor, or maybe just increase the frequency of the external audits you already have.
If they should decide that they want you to wear "Many Hats", I would consult with your existing external auditor to determine which types of things you would be okay to handle and which things they recommend you not handle - so that you do not run into any potential conflicts of interest. They should be able to give you some guidance on this.
Good luck!