The main feature that is included in girl beds is the availability of storage space. The bed that lasts through the teen age years can be filled with accessory spaces like for studying and for storing her cloths, make up items etc.
The quality of the beddings must be considered highly. This is to ensure that you are buying something that will last for a long time. It is indeed true that the those with high quality will also cost more but you have to realize that in the long run, you will be able to save a lot if you will buy quality beddings. These are not prone to tearing. Look at the thread count and feel the softness of the bedding.