Cosima is scared, that's true. But she also would always rather know what she's up against, which means cautiously peering out what's left of a window at the battle. It's... impressive, and utterly foreign, and she has a moment where she wonders if vivid delusions are a previously unreported side effect of her disease. (Surely it would have turned up in at least one other patient.)

She watches, but she's also aware of her own limitations and stays put. She does spot one green floating creature (a Wraith, she assumes), but it's far off and mercifully doesn't seem to notice her. She's right where Christine left her when the battle ends.