Facebook log in concerns

[GSB]

I'm voluntary tech support for my grandmother currently. Facebook has always been a pain. She is unable to login to her account so I cannot login to Facebook to submit or send a support ticket and I cannot post on Facebook community forums. 

The problem:

When I try to login to her account, she remembers her email but not her password. We then click on forgot password and it brings to a page which lists a recovery email where it will send the password instructions. That recovery email is unfamiliar to her. We then try and use the mobile phone number linked to her account to log in. It sends the usual account code to login and when we finally login to the account via the mobile code, we login to some random Hispanic woman's account, leading me to believe that her account has been hacked. If anybody is familiar with Facebook please help! She owns a restaurant and she posts her menus and flexible hours daily and now that she is unable to post that, she has lost quite a bit of business.

[BonBonBourbon]

yeah i guess it has been hacked and since you have actually logged in just change the details in the settings so that the other person cannot access it later on and see if there are any posts on the account which you grandma posted or something that might be a good way to verify if that is truly her acc