As for the meaning. I think she is saying how as people, we don't need much to be happy. We should be content with what we have and shouldn't ask for more. She using nature as a metaphor for life and what happens when we die. Hence the line, "someday our bones here they will lie" because after we die, we become part of the earth. The metaphor is being used to tell people to enjoy the time they have on earth. One day, despite or best efforts, we will die and never have that time back.
As for the meaning. I think she is saying how as people, we don't need much to be happy. We should be content with what we have and shouldn't ask for more. She using nature as a metaphor for life and what happens when we die. Hence the line, "someday our bones here they will lie" because after we die, we become part of the earth. The metaphor is being used to tell people to enjoy the time they have on earth. One day, despite or best efforts, we will die and never have that time back.