Well, that is how deaf people speak to each other, for sure. They don't use full sentences as you or I would consider them, it sounds more abbreviated to a hearing-enabled person, because we blabber on and have lots of filler in our language when we do it verbally. It sounds like the child has picked up her language from her dad. Does the school think she can't hear, or that she can't form words? Or is the speech therapy suggestion just so she will get some clues about how to talk to other kids and won't be ostracized? A speech therapist would be able to tell in about a minute if there is a problem for this girl or not.