She leaves her apartment for the first time in years to visit the bank, mistakenly going to her. Nana sends jerry a check for $10 every year for his birthday. Aug 25, 1994jerry gets in trouble with his girlfriend for not saving her thank you card after he received and read it.
According to uncle leo, jerry's nana hadn't left her apartment in 25 years before this episode, which leads to her thinking she has to physically go the bank and sets off the whole subplot.