I don't know how old your mother is, if she is over 100 years old as I am, it is normal for her to say this to you, because the standard of living of people in our time was far from being as affluent as it is now, and we didn't have so many ways of earning money now, and at that time most of the life was sustained by saving, and that's the way our parents educated us.
If your mother was born in the late seventies, early eighties, in the living conditions are getting better and better today, she is still able to educate their children in this way, at the same time, she can usually do this herself, that she is a good mother of three views.
This year's epidemic, so that many people stay at home for several months can not go out to work to earn money, if the usual big spenders do not have a little savings, then appreciate the benefits of thrift.