Having currently 2 grandchildren of similar ages to OP's, I decided to observe their communication skills. Neither has very many clear words, but they obviously hear and understand a lot. They respond to name, obey simple commands, such as "show me the car", "where's the ball?"(points). So even if they're not talking much, they are hearing and understanding.
If OP's grandchild is not responding in this way, it would indicate a possible problem with hearing, or something else. However, having alerted parents to it, there's not much more that she can do- should be picked up at routine developmental check around 2.
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This sounds awful … Elderly lady euthanised against her will in Canada
