Can't comment on all of your concerns but any early years provision should certainly be observing children and keeping some sort of record. Regarding development, children under three learn primarily through play. So as long as there are a variety of activities covering all of the different areas of the EYFS your daughter should be fine. Also, at two years old, though they will no doubt engage with one another, children generally play alongside each other rather than with each other. I would imagine that as long as they are being spoken to and interacted with by adults their language will come when it's ready, it's just being stored up at the moment, and social skills come too. I think they normally start really playing and interacting, making up games etc, when they are three or four. I think it's always worth communicating concerns when your child is concerned however so why not ask for an informal chat with her key person, or the nursery manager?