Facebook odity

You need to provide more information. Are we talking about something she uploaded herself, something she shared from another user, etc.?

Also, if she did absolutely nothing on Facebook (I have a hard time believing that), then the next question is whether her system is compromised by spyware.

Hi Jespah . It was her own post uploaded from a smartphone It was posted at night but the next morning it no longer showed on her timeline but notifications of comments are still coming and if you open those you can see the original post

The phone apps are often weird or incomplete. If she reposts from a PC or tablet, does she get the same problem?