So, she's not really thrilled with the idea of fighting him again, but if needed, she'll try to hold her own. Hysteria mode offers her a temporary boost, but that's like a five minute some deal and it's basically a berserker thing.

Alternatively, she can try and help him out afterwards, though, I don't want to assume he'd be inclined with that. The vorpal blade can cut through metal, etc.

Basically, she'll try to talk him down and help calm him, either way.