16 month old language development advice..?

She understands what you are saying and has alot of verbal baby talk, so she seems fine, it is also normal for children to say mama and dada but not actually say it in reference to their parents for quite a few months, I think at about 15 months my daugher was saying mum mum and had only just started referring to me when she was saying it, also Da for Daddy, ta, Car and Gog (Dog) with both my children it wasn't until about 18 months that I noticed with both of them a huge influx of words, its like they were taking it all in then all of a sudden out they all started to come! But all children are different, my daughter is not quite two now and she has a little friend that is two months younger but still only says a few words but she started to walk at 11 months where my daugher didn't walk till 16 months. Give her a few more months, talk to her about everything, read to her lots, sing little songs to her, don't worry about coaxing her, otherwise they can just get frustrated and just enjoy watching her develop at her own speed. Also another thing you may find is that words that she previously has been able to say, she may suddenly stop saying especially if she is going through a different developmental phase like learning something new physcially for example, and this is perfectly normal too, she hasn't forgotten the words just put them on hold for the mean time!