Trying to find out who could be interesting then. Or at least useful.

The fact that you included food, a basic necessity which we've clearly marked and mentioned in multiple resources, indicates you're not invested in looking for it yourself, in which case someone would need to bring it to you, unless you intend to starve.

[She's noticed that Watson knows him -which was no surprise given who the two of them were. But Sherlock could have just messaged him directly in that case. Either he hadn't noticed Watson was there -unlikely if he really was Sherlock, or he had something else in mind.

Also trying to figure out what to expect from whom while keeping people guessing about herself is something she'd do.]