What is the meaning of "mind frame"?
"Bottom line," Wendy said, "you stole from your clients?"
"Yes."
"Gave yourself a decent salary?"
"It was part of keeping up appearances."
"Right," Wendy said. "I see."
Phil smiled. "You're right, of course. I'm just trying to give you the MIND FRAME, justified or not. Did Ridley tell you why they first started looking at me?"
She nodded. "You lied on your resume."
(Harlan Coben)

Question

Answer

Sasha,

"Mind frame  or frame of mind" refers to your mental or emotional state that is the basis for your behavior.  It is also the way you feel or think about something at a particular time.

Whenever you may feel down, try smiling and there is a good chance that it will put you in a better mind frame for the rest of your day.
A couple of beers will put them in a positive frame of mind for the final game.