My thinking - She took the drugs. She sat at the bar thinking, looked at the drugs again, then changed her mind and intended to put them back early next day. When the captain came to her door to relieve her of duty, she went along meekly because -- while Mare is messy, impulsive, and complicated -- she is not stupid. She now knows that somebody else has framed her.
Again, I am working the Zabel theory because the show is not giving us much, or giving us too much. Big named actors generally sign on cuz their part has significance. Jean Smart (Helen) is going to move the story about Dr