Ane grew up around here and knows of boats that are too small, or too unreliable to leave the harbour, her sister and she used to use them all the time for joyrides close to the shore. They would not be missed —she is sure her father is out, anyway, and would not object to her borrowing one of the family's derelicts, but she does not want to involve the family if she does not have to.
Besides, she is more than a little high right now, so she is willing to go along with Jasra's suggestion, assuming the girl knows what she is talking about.