My Mother passed away and I need to deleted her two Facebook accounts. Someone hacked one of the accounts and is sending out friend request. Nothing from Facebook’s help site works. How can I delete her account?
Sorry for you loss. You can Report a Deceased Person to Facebook.
From Facebook Help Center:
How do I ask a question about a deceased person's account on Facebook?
We can help with questions or requests from family members, including requests to remove their loved one's account. Learn more about what happens when an account is removed from Facebook.
If you'd like to submit a question or request regarding your loved one's account, please contact us.
You can directly Report Compromised Account.
You can learn more about Hacked Accounts.