Help with iPad malware and how to get rid of it.

It is my grandmother's iPad. She says she does not remember doing anything that would result in malware being downloaded. I have deleted any unfamiliar files and apps, and cleared all browser pages. But, the issue persists.

What happens is that the screen will randomly go black, then after a few seconds a human eye pops and watches you for a minute. You can't exit out of it or turn the screen back off, but the eye closes on its own after a bit.

Does anyone know what this is, specifically, and how to get rid of it?

Thank you in advance.