Translation of dunkel werden

Some of the disadvantages are the coldness, darkness and the fact that the days are a lot shorter then as in the summer. First let me tell you what I do not like about the winter. It is the following.
I think that subconsciously she means that her pregnancy has become a white eleph. But even though she compares her pregnancy with the large, grey animal a moment later she regrets it and says it.
It was fantastic to see that each ice berg had its own form and color. Unfortunately we could not reach all galciers, some were blocked by their own ice breaking off and floating in the lake.