This was me as a child as well. I spoke a word or two, then one day completely stopped speaking altogether. Went to speech therapy and started again but I had a stutter. And like you, mine was worse when I was younger too. I still very much deal with it every day and every sentence but I’ve learned what things help and what things don’t help. My best advice to you is speak to her doctor. She is only two and I bet he will tell you to give it time, but always express concerns as soon as you see them.