Grandma is so frugal she won't waste even a needle or thread.
Tips
culture
Most famously associated with the PLA's 三大纪律八项注意 ('Three Rules and Eight Points'): 不拿群众一针一线, don't take a needle or thread from civilians. The phrase is now a stock symbol of strict integrity.
history
Recorded in 曹雪芹's 《红楼梦》, where Wang Xifeng claims to know every needle and thread among her maids' belongings.