At first I couldn't find a single link between a young girl going through puberty and Russia. 1921 was of course the time of the Russian revolution, there was drought and starvation, people were dying left and right in the millions.Meanwhile this girl  is going through puberty but she cant grow, That's where it suddenly hit me.
The possible message the author was trying to convey was that, leaving a girl without food and water is the same thing as not giving a girl attention and caring about her, either way she will not grow into a beautiful mature woman, Its a lesson that some people have to acknowledge, its something that all girls need.
       This Poem is very symbolic as well. The young girl represents Russian itself. Neither Russia or the girl are advancing in a positive direction, Russia has a drought, the young girl can't drink, Russia has no food, the young woman is starving. But both Russian and the young girl have a potential to bring wonders to the world.