"If you hadn't met Wash yet, and he wouldn't tell you anything, how do you know about back home?"

She doesn't sound suspicious, just confused - since she is, genuinely, confused about that. The favoritism points aren't exactly what she's aiming for - she just doesn't want to go home and get stuck in the murder fridge again.

She looks at Grif, and then tilts her head. "Wash was talking to Big Bird after Locus rescued us."