As your 3-4 year old child is growing up and learning new things everyday, she will be involved more and more in make believe play at this stage.
What you need to know
At this point, your little one will make stories around an imaginative character that she loves to be around and she will enjoy being like that character. She might need your help in dressing up like that character or she might talk like one, so you just have to observe carefully that trait in her. Just make sure that she does not follow any bad character and try to copy that.