A.,
No, this is not typical development. This will red flag any two year old developmental screen. I asume that you have been told that since she has an imagination, you have nothing to worry about or you would not have mentioned it, but kids can be off in thier development and still have imaginations. Mine did.
Don't mess around, get her evaluated now, you have nothing to loose, and she may have the most important years of her life to gain (when early intervention is the key to sucess) You would not be asking us if you did not already know that you need to check this out. That little voice is telling you that something is amiss. Developmental pediatricains are the best reasource for this age group, but you can start with a screening program through your state, it is the help me grow program in Ohio.
I am not saying that this is autism, but let me say that all children should be screened for autism by age two, and many developmental issues (autsim and others) can be picked up early if you are looking for the signs. If this screen has not happened in your pediatricains office, ask for it. April is Autism awareness month, read something about it and learn the signs, the myths are many, and you may be surprised at what you don't know about autism, and that what you think you do know may be dead wrong.
ASD effects one in 150 children, it can be mild or severe, and there is no one skill that will "rule out" carring the diagnosis, including having imagination. Some talk a blue streak, but thier social interactions with their peers is impaired, you have already identifed this as a concern, early intervention can work wonders for kids with mild issues.
If nothing else, you will have someone with real evaluation to tell you to stop worrying about it and you can never wonder "is this normal?" again. Worst case scenario, you will get a leg up on helping her make the most important progress in her life, by begining early intervention.
M.