Molly pretty much just fell into Murphy's dream. There would have been no way for her to know what sort of landscape she'd drop into so had no expectations. It meant she was able to keep herself from going into the drink.
She literally stood on the water as she got her bearings. She recognized this, and the boat. The Water Beetle was the painful point in Murph's dream being somewhat sharper than anything else, drawing the attention. She's not surprised that this is what Murphy dreams about.
She spotted the ex-cop standing in a dingy with the creature and frowned as she started walking towards them on the water's surface. Dorsol fins appeared around her, but she ignored them. "I'm surprised there isn't a nervous piano instrumental to go along with this."