My son and niece both just turned two. My son talks non-stop all day. He is counting to five, names everything he sees and talks in short sentences. My niece however only says mama and dada. Because she is not talking we do not know if she understands the concepts my son and other two year olds are learning. She was working with a speech therapist but all they did was try and teach her sign language. She ignored the therapist for the most part. All she learned was to say "more" by signing where as before she just grunted for it. Any ideas on not only getting her to talk but also getting her to understand naming, numbers and such without being able to talk? She also likes to play alone rather than with other kids.
The speech therapist did a hearing test in their home but I don't know how accurate that is. She was born without a soft spot and has caused her head to be small. The doctors say all the scans for that came back normal. The doctors have been little help but are finally going to test her for a few things. She doesn't act different or anything besides playing alone.
We realize that we should'nt compare the two but it's hard when we are contantly monitoring her to make sure she is learning due to her other issue.
I think I need to clarify that the Dr's are getting concerned and seem to not be offering any answers.

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You might consider a specialist to see if anything else is going on with her, being secluded to herself may be something different. I am sure there is no family problems at home but I would consider a specialist. I am sorry for saying this but I watch House last night and the had an Autistic child on their and gave some of the symptoms and not talking ans social behavior play a big role in autism. Look it up and find out some of the warning signs. Only a suggestion, I watch these types of show way to much and it make me go on a look out. LOL. I am not implying that she is only a suggestion.