She'll understand fast enough; servants always guess when there's a sweetheart in the question.
Most likely she'll place the things ready for Matty in one of the bedrooms.

I'll put in your best evening shoes too, Matty, love, and my old black lace fan, in case you should flush up dreadful when the captain is paying you attention.

And now, Sophy, you'll just be good-natured, and leave the parcel with the parlor maid, so your sister will be prepared for whatever happens." Sophy, having been judiciously bribed by the loan of a large Cairngorm brooch of her mother's, which took up a conspicuous position at her throat, finally consented to carry the obnoxious parcel.

Alice was further instructed, in case Mrs.Bertram so far failed in her duty as to neglect to invite Matty to stay to dine at the Manor to try and bring Captain Bertram back with them to supper.
"You tell him that I'll have a beautiful lobster, and a crab done to a turn ready for him," whispered the mother.

"You'll manage it, Alice, and look sympathetic when you speak to him, poor fellow.