Final answer:
The priority intervention is to determine the client's knowledge regarding gestational diabetes.
Step-by-step explanation:
The priority intervention in providing discharge planning for a client with gestational diabetes is to Determine the client's knowledge regarding gestational diabetes.
By assessing the client's knowledge, the nurse can identify any gaps or misconceptions that need to be addressed. This will allow the nurse to provide education tailored to the client's specific needs, ensuring that she understands how to manage her condition effectively and minimize complications.