Via a spoiler roundup on MJ's Big Blog, in Glee season 6 episode 3, "Jagged Little Tapestry", Sam tries to convince Coach Beiste that new (gay) football player, Spencer should get promoted to quarterback - but it may not even be Spencer that's the real problem with Beiste.
Spencer wants a shot at being quarterback, but Beiste isn’t convinced. Sam champions Spencer’s ambitions.
Beiste is acting weird, and Sam and the team, including Spencer, are worried about her. It turns out she has a huge personal issue going on. Everybody, including Sue, promise to support her.