Marian had been surprised by the early summons to dress and be prepared to accompany The Sheriff to Locksley still. For what, she was informed once dressed and arriving at the gate, would either be the hanging of one of the peasant boys or a trade with Robin for his property. The Black Diamonds, she now knew were used to make the Damascus Steel for Guy's armor.
Things she didn't offer any knowledge about, only annoyance. Being pulled from her bed to attend to his dealing with 'an outlaw,' when her father was still doing poorly and her time was better spent at his bed. It wasn't exactly a lie either, but dissent meant The Sheriff ordered her into the carriage.
( It wasn't as though she could ask why Daniel was still at Locksley Manor )