The “we” Nievu is talking about is her and Wynn and not necessarily Siyav and Shirley.

Siyav: What?!
Nievu: I invited her over  so you you all could meet her before we’re stuck traveling together.

Wynn: That’s…actually pretty smart.

Shirley: And you invited her to my house because?

Nievu: It’s the first day we weren’t at Wynn’s hovel or a public space.