Sue’s head had swollen alarmingly; she had two enormous black eyes, and now she showed us a deep cut on her arm. When I asked why she hadn’t made more of her injuries before this, she replied, “I didn’t want to worry you when you were trying to save us all.” 
what character of sue is reflected over here?

Dear student,

The given line was spoken by Sue. She did not want to bother her father by crying over her injuries because she knew that he had being trying really hard to keep his family alive. The kids believed that what mattered was their being together, irrespective of the situation they were stuck in. He said that he was not afraid to die till they were all together. Both Sue and her brother were selfless and cared about their father's struggle, Sue loved him dearly and had complete faith in him. Thus, she acted maturely and did not want reveal her pain so that her father could concentrate on saving the ship.

Regards