What to eat when super nauseous?

I’m not quite sure if this is the right place to ask, but i couldn’t find a better option.

My best friend’s boyfriend broke up with her four days ago, and she hasn’t been able to eat since because she feels really nauseous.

I tried looking up things to eat when you’re nauseous but those foods were either stuff he would make for her or stuff she felt nauseous thinking about.

So I’m wondering if any of you here know what to do to fight the nausea or what food she can try eating.

I’m really worried about her so i would really appreciate any help i can get. Thank you