"Same price for the voice-link rocks, and a few alarm-sticks to call you in for fires?" 

Wait, what if she's the sort of adventurer who'd set her own fires to be a hero extinguishing them? 

"Say, fifty gold pieces for one alarm stick now, to be refunded by you if we break it and you don't help with the firefighting. If you can help then we'll talk about buying more after."

Wait, what if none of the infusions she sells work except for the ones she offers for testing, by some trick of her strange magic?

"And leave us a few of your hairs, so if you don't show at all when we break an alarm-stick we can scry you to check whether that's because you're injured or captured by something?"

She is running on too little sleep for this. Lesser Restorations help but they're not enough.

"What, we gotta get the coin priests in on this? I'll charge extra for the annoyance. Also, letting you track me, el oh el. El-mao. No. Here, five free samples."

She waves her hand as if doing a slight of hand trick and half slaps them onto the desk, five unassuming wooden sticks.