Silhouette does wait for Kaelvorr's report. On hearing it, she briefly rifles the spells at her disposal and shakes her head. She hasn't got anything that will make a troll smaller. She does indicate the kobold that has a potion on its body and says, "Search that one, and you'll find a bit of magic. I think I'll take a look ahead and see if my sight reveals anything to me that Kaelvorr missed."
She then moves ahead into the tunnel and cave, still invisible, and hoping to make use of the last moments of her Detect Magic (though she'll recast if she must).
She doesn't stray far from the tunnel though, until her allies of the moment come piling out.