god created her deaf and cant speak

gehad abd elkarim mohamed 14 years, a pupil in the school i work in as a doctor.
i saw 3 girls standing by the window of my clinic, i told them :lets hear mohamed hamaky song, i turned on my mobile and began to sing with the singer and the girls sand with me, suddenly i discovered that gehad is deaf and cant hear the song with us and cant either sing, i was hurted for her , but i continued singing and looking at her with great compassion and love. instead she dosent hear the song , she interacted with my feeling and smiled to me and enjoyed our song, my love and kindness reached her instead of her deafness, after that she entered in my clinic, i sang for her for the second time and also danced for her in the school clinic, she liked my singing and dancing.
poor innocent gehad , she cant enjoy hamaky song , she cant sing nor dance . she dosent enjoy life like me.
why god created gehad deaf?
i think if god exists he wouldnt deem her this cruel situation.