How is the character of Frau Grubach introduced in “A Conversation with Frau Grubach”?

"The only person I can discuss [my case with] is an old woman," K. says to himself while looking at Frau Grubach. To her the trial "seems like something scholarly." Frau Grubach is K.'s landlady and she is very fond of him, though, like most everyone else, she avoids shaking his hand.