My sister has an S3, it's old now and kind of buggy. She has had a weird app appear in her apps menu that says "camera" but it's grey and when you tap on it to try and open it, nothing opens, it just comes up with the option to re-name it. She has tried to delete it several times by dragging it up to the trash can, but it doesn't go anywhere. Could this be something she has created by mistake or could it be a virus on the phone? Thanks