Early-morning are the adverbials in this sentence
Yes, it does, the sentence should be written like this: Beth, my two year old sister, is very curious, so I have to keep a close eye on her.
The Boy in the Striped Pajamas" is a historical fiction book about a family that has to move away from Berlin to a house near a concentration camp, where Bruno's father works. Bruno, the nine-year-old boy of the family, notices a "farm" outside his window. This farm is actually the concentration camp, Auschwitz. Bruno eventually befriends Shmuel, who is a Jew in the concentration camp.