More likely that they plan to kidnap the poor servant, and send a threat that if Leslie doesn't come over that they will torture the poor bastard.
But the Nanny is probably inadvertently going to ruin that plot from even starting in earnest. (Can't remember the nanny, and atm to lazy to go through the earlier chapters, but I'm guessing that Leslie will deny that she was good for her, at which point she will jabber on while trying to appeal to the family before revealing that this odd conversation.)
With any luck this will also be the final nail for the Sperados
@MapleTreeWithAGun was the nanny really nice to her? I only remember the servants looking down on her. And didn't she just knowingly give the Sperados some ammunition?