Jody, this is all normal, she has found her voice. Remember all kids are different and try not to compare your daughters. Trust me I know it is hard, I have 5 and am always looking at their differences and similarities. My 2 youngest are a combination of their older sister and brothers, which is kind of cool. I now look at it in a positive way, for example, Jeffrey was a cuddlier when at the same age as Derek is now, this is so cool, he is just like Jeffrey. Then I will see something that reminds me of my daughter, and so on. One story I love to share is when my now 12 year old was a year old and went through a screaming stage whenever we went out, he would yell "I want the Cock, COCKIEEEEEEEEEEEE are you?" He couldn't say Becky so he called her Cockie or or The Cock. Trust me people would look at us like we were awful parents allowing our son to say things like that. LOL Now we just bust his chops about it and can't wait until he gets married so that I can toast to that story. LOL Bottom line, as long as you don't expect the same thing of each child, as they are each their own person, you will be fine. Hope this helps and put a smile on your face.
Hugs,
T.