flower girl gift

What do you think of this for my fg. She is 4 years old. It is a locket necklace form Things Remembered. I figured the chain can be changed if its too long or too short. I wanted something that she can continue to use so I don't want it to be too babyish. I just want something she can hold onto that will help her to remember the wedding since she is so young. Thanks for any help

Thanks girls I am going to order it tonight. Emma will be getting the locket, a flower girl t-shirt and some activities to do at the wedding. Thanks again for the help.