Why does Shelly come to visit the Underwood’s house in Chapter ten?

Shelly dropped by one afternoon. She said the boat was at it again—dumping the waste right in the marina. They didn't even try to disguise it. The big bald-headed thug was from Morocco and named Luno and he was Dusty's head security guy. She told Paine not to sink the boat again especially if she's on it.