Is my daughter autistic?

my younger brother is autistic and reached all the milestones the same as any other child talks and all. 3 of my cousin are autistic and sound just like your daughter but they wont test till the child is 4 or 5. id go back to your gp and ask about speech therapy, its hard to tell if a child is autistic as some are just late developers so id go ask your gp for advice and speech therapy might help