The correct answer is:
She should contact the person at her company that handles insurance policies, premiums, etc.
Step-by-step explanation:
This person would have access to Michelle's insurance information, specifically the details of the policy.
The insurance representative at her company may also be able to directly contact the hospital and/or the insurance company on Michelle's behalf. If this is against policy, the representative would at the very least know which person Michelle should contact next.