I reckon that people of your grandmother's age, and probably us as modern people, didn't appreciate the hardship of their life at that time. I remember my mother once told me that her family was particularly poor when she was a child, and that she had to walk dozens of miles to collect rags so that she could sell them for a few more cents.
Similarly, there are some people who are now living a fulfilling life and don't need to do anything to collect money at home, but they can collect a lot of money, which is higher than some white-collar workers' salaries. But she is really at home inside the idle, she is not a kind of people, she is not a kind of days like to enjoy the blessings of the people, she likes to keep themselves busy, like in their own can still dry move time, in more go out to see the world, see a person.
In the same way, your grandmother always likes to pick up things inside the garbage dump, why do you want to persuade her not to go? is! Although, there are some people who think that grandma is already old and it's better for her not to do these very hard things anymore, you walk outside, going up and down the stairs can be heartbreaking, not to mention going to this very dirty place.
But you have to think, you have to understand to the grandmother what kind of idea she has? Is she there to make money, or is she there to reminisce about the past when she's bored.
There are times when the thoughts of the elderly are so different from ours. We think that the old man is old enough to be at home, but the old man's idea is, I want to go out again, even if it is to pick up some garbage and sell it, it is also a very good thing.
So talk to your grandma and find out what kind of idea she has. If you can't, you can let your grandma go out less often, but never get in her way. Old people, just go along with what she wants. Don't get in the way.