This question made me smile!
My 18 year old daughter STILL loves lots and lots of stuffed animals. She doesn't play with them anymore, but her bed is literally covered with them and she sleeps surrounded by them every night. She only took a few to college, but she sleeps with them all around her every night in her little twin dorm bed.
She loved playing with them as a child, and was barely interested in dolls, although she did play with little plastic animal sets a lot. We thought this might mean that she was extremely interested in animals, but other than loving our cat and dogs, she isn't really particularly interested in real animals. She just likes cute, cuddly furry things!
My suggestion is to limit how many other toys you buy, because your daughter is going to mainly play with the ones she loves most, and it may continue to be stuffed animals. When she's bigger, she might like little plastic animal toys like Littlest Pet Shop.
The way that she's playing shows a vivid imagination, and this is the healthiest kind of play for brain development--much better than playing with toys that only do one thing or don't require much pretending. She's probably very intelligent.