In the interest of keeping things moving: once it's her turn again Marissa will, barring other unforeseen dramatic developments, start searching the place. Should I make any further rolls? She will have Dancing Lights active, to note, and will want to check out the alcove to the right first (unless that's what we were looking at this entire time, my memory is horrible), followed by the dark area. She'll try to get Canin and Dog to go with her, because Scent and Darkvision.