根据以下要点，写一篇介绍美国残疾女作家海伦·凯勒（Helen Keller）

根据以下要点，写一篇介绍美国残疾女作家海伦·凯勒（Helen Keller）的短文。
参考词汇：the deaf-mute 聋哑人
要点：
   1880生于美国
   19个月 因病丧失视力、听力以及语言能力
   7岁 遇上女教师Miss Sullivan, 在其帮助下学会了读、写、说
   24岁 以优异成绩毕业于Radcliffe College
   著作 The Story of My Life, Let Us Have Faith
   贡献 倾毕生精力为全世界的盲人和聋哑人服务
字数：100左右

注意：适当增加细节，使行文连贯。

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Born in 1880, Helen Keller is a well-known American woman writer with disabilities. When she was 19 months old, it was unexpected that Helen Keller was robbed by illness of sight and hearing, which caused her to become mute. Fortunately, at the age of 7, Helen met Miss Sullivan, who was very kind-hearted and helpful.
    Miss Sullivan managed to help Helen learn to read, write and talk. With the help of Miss Sullivan, Helen went to study at Radcliffe College and graduated from it with honors at the age of 24. During her whole life, Helen wrote some excellent books, such as The Story of My life and Let Us Have Faith. Besides, she devoted all her lifetime to working for the blind and the deaf-mute both at home and abroad.
    All in all, Helen’s example has encouraged a lot of people whether they are normal or disabled.