Nigella's eyes say it all in the pictures. She's trying so hard to speak to him with her eyes, to plead with him. She is very passive seeming and resigned as people have said. It is very sad, because, by causing no fuss it's as though she is actually trying to protect him from what he is doing in public. Fear is in the pictures.
Yes! That is exactly what she is doing.
No she shouldn't be mortified. Again this is portraying that as the victim she is in the wrong.
No, that's not what it's about at all. Just because she might know, rationally, that she is not responsible for his actions doesn't mean that she won't feel mortification at the way her privacy has been invaded and her pain has been exposed for all to see. We don't know what is going on in this relationship but all we do know is that for her own reasons she isn't ready to leave it yet. And so she shouldn't have to have this crap to deal with as well. It is mortifying. that doesn't mean she should feel that she is to blame.