Why was Alicia fired from Maria's?

Alicia was fired because she was Jewish. If anyone found out that she was helping Maria... Maria's family would be in danger.

I tried to put myself in Maria's place. She was right to let me go. If her "good neighbor" would tell another "good neighbor" that Maria had an orphan girl helping her, and they put their heads together, they would know it could only be a Jewish girl. If someone betrayed me to the Ukrainian police or the Germans, Maria's family would be in danger; so I had to go.