Yep, Sam is the nerdy, introverted girl. She's living at the mansion, and seems fixated on "helping" with Alan Michael and Harley's wedding. I'm not sure if she's there to sort of "befriend" Harley who is still very rough around the edges, or if she was sent to live with Phillip rather than Ross for some reason, and afterwards went to live with Ross.
As Alan is trying to manipulate Alan-Michael at this point, he's probably smiling at anyone who supports AM/Harley getting married. But as Sam is so unfiltered in a Jane Austen-ish sort of way, she can't offend anyone.
By
P.J. ·