I would have believe that your girl's progress is normal; at least she has made an attempt to speak and not keeping quiet all the times.
My girl is almost 17.5 months now. She can't string one proper sentence except for 1 or 2 syllabus words. She can say 'dad dad', ' ', 'eat', 'sleep', 'bye', 'thanks' (sometimes will say thank you), 'please', 'flower', 'dog', 'shower', 'soup', 'baby', 'milk', 'wash', 'shoe' etc
Only on 2 occasions that my girl uttered two 3-syllabus words - dinosaur and kangaroo. We tried to encourage her to repeat these 2 words but she never want to do it again.
Through my observation, I have noticed that my girl are better in using her body language and gestures to convey her message across. When she is in the cheeky/playful mood, she will give us a 'wink wink' by blinking her eyes with a big bright smile. She will tilt her head and rest it on my shoulder when we say good night to her. Sometimes, she run and fell on the floor or hit her head against the carboard, we will say 'bong' and she will touch her head with her hand to express a bang/hit/knock on her body parts.
Her progress may not be as good as some toddlers who are as old as her, but I know my girl is learning and she is getting there. With time, she will build up enough confident and then will eventually speak more. As parents, we just have to keep encouraging our kids.
I believe that each child reaches the milestone at his/her pace; dont't loss heart and be patience, I am certain that your girl will do well and even surpass some kids in speech department in 2 months' time.