do what is best for you and your daughter.
This is a subject that arises strong feelings on this board!! But take no notice.
We have a son who is just 6 (was 5 on his last trip to wdw) and looks like a 8 or 9 year old. He is not used to walking long distances every day for two weeks, so we often rent him a stroller. He also has a problem with one of his feet,which means that he is not as active as many other children his age (however, this is getting much better now)...
we have never had any negative comments from anyone about the stroller.
take no notice what anyone else says, and do what is best for you and your dd!