SPOILERS AHEAD
Let's see what stage you're currently at... what did Emily and Kathryn say when they checked out (certain conditions have to be fulfilled in order for them to be hired)? If they said, "You can now hire us...", talk to Wodehouse as usual after checking everyone out and you can then hire Emily and Kathryn during Set-up by going to Rooms > Amenities.
If you don't see that in the Amenities screen during Set-up, could you attach screenshots of the Tasks screen and the Amenities screen? Thanks!