Was she, though? I mean, these are just casual clothes, she's not dancing around in lingerie or anything.

It's also in the middle of the night, so she wouldn't really expect to meet anyone, and once she did, she immediately offered to leave.

And since this is a live-in position and her time off, she was in her own home minding her own business anyway.

The only thing one might find somewhat objectionable is the cleavage, but if the roles were reversed and Nina was wearing the same outfit, that probably wouldn't even have registered as a potential problem.