Thomas and Maggie
Maggie was aware of the ordeal with Lydia from a distant standpoint. Being married to Stiles' dad put her in the circle of Beacon Hills by default. And of course she knew who Thomas was because he bore a striking resemblance to Stiles.
She greeted him with a smile as their paths crossed after getting food at the taco truck. "How's it going?" she asked him, making casual conversation. She knew who he was and assumed he'd know who she was, in turn.