We're one day's ride away, and can likely send a message with any of the travelers passing by (a sealed message or word of mouth, whatever you deem prudent, Tunder). I think the stakes are a bit higher than a few suspicious townsfolk, and Hemlock is the only one who know's Mirela's connection to the murders, and when we we return we'll have plenty of substantial evidence. I'd rather move on to the next setpiece, I'm wary of slowing the pace down too much as we've a whole lot more adventure to get through. Just my two cents on the matter.
It's the whole town, actually, word of the murder can't be kept quiet long. Once the word is out, Hemlock can't keep Miri's "involvement" quiet. We also, might be able to get some help for our next stop. I mean we're just some country bumpkins going to the big city to cause trouble for a noble.