Corrected entry: When Jerry and Dorothy see the deaf couple in the elevator, Dorothy mentions that her favourite aunt is hearing impaired - yet at their wedding later in the movie, Dorothy doesn't have any relatives from her family attending, aside from her sister. Funny how her favourite aunt just didn't get invited to such an important event. It makes it obvious that the writer had to make up a reason for Dorothy to know sign language.
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Correction: There's many possible explanations. Her aunt may not still be living, she may not be able to travel, she may have not been have been able to make arrangements on such short notice, etc.
CocoCami
Deaf people also don't like to be called hearing impaired. One would think if she bothered to learn ASL for her that she would know that.