I know it's been a while, but I haven't changed that much, have I? She decides to approach Mona about it. Hanna greets him warmly, but Mona shoos him away. They aren't considered friends and mainly tolerate one another when in public settings. She expresses that Spencer should be grateful she's not with Toby anymore, but Hanna knows how much Spencer has been hurting, she isn't so sure.
When the Liars escaped the Dollhouse, Mona left Rosewood for several weeks to recuperate from her traumatic experience.
She leaves the hotel room while Spencer continues to search. She is with the Liars and Caleb to figure out where Hanna is. Wren says he doesn't know what that means but he thought that they'd trusted each other when she was first a patient there. Years later, Mona was the first to figure out Aria was on the A. Thrown From The Ride.